Halogen Containing Organic Compounds Flashcards by Khristine Tapado

Which C-X bond has the highest bond energy per mole?
a) C-Br
b) C-Cl
c) C-F
d) C-I

c) C-F

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Which alkyl halide has the highest reactivity for a
particular alkyl group?
a) R-F
b) R-Cl
c) R-I
d) R-Br

c) R-I

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When ethyl chloride reacts with nascent hydrogen, what
is the formed product?
a) Methane
b) Propane
c) Butane
d) Ethane

d) Ethane

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Which of the following halide can give best SN2
reaction?
a) Primary alkyl halide
b) Tertiary alkyl halide
c) Secondary alkyl halide
d) All can give SN2 reaction at same rate

a) Primary alkyl halide

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Which alkyl halide out of the following may follow both
SN1 and SN2 mechanism?
a) CH3-X
b) (CH3)2CH-X
c) (CH3)3C-X
d) (CH3)3C-CH2-X

b) (CH3)2CH-X

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When two moles of ethyl chloride react with two moles
of sodium in the presence of ether what will be formed?
a) 2 moles of ethane
b) 1 moles of ethane
c) 2 moles of butane
d) 1 moles of butane

d) 1 moles of butane

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The molecular formula of DDT has how many chlorine
atoms?
a) 5 chlorine atoms
b) 2 chlorine atoms
c) 3 chlorine atoms
d) 4 chlorine atoms

a) 5 chlorine atoms

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In primary alkyl halides, carbon attached to the halogen
atom is further attached to how many carbon atoms?
a) 1
b) 2
c) 3
d) 4

a) 1

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Which of the following is not the method of preparation
of alkyl halide?
a) Darzen’s method
b) Halogenation of alkene
c) Addition of HX on alkenes
d) Hydration of alkene

d) Hydration of alkene

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Why alkyl halides are considered to be very reactive
compounds towards nucleophile?
a) they have an electrophilic carbon & a bad leaving group
b) they have a nucleophilic carbon & a good leaving group
c) they have an electrophilic carbon
d) they have an electrophilic carbon & a good leaving
group

d) they have an electrophilic carbon & a good leaving
group

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Which of the following is the commercial method of
preparation of Chlorobenzene?
a) Raschig process
b) Wurtz Fitting reaction
c) Friedel-Crafts reaction
d) Grignard reaction

a) Raschig process

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Which of the following reactant gives the best method
of preparation of alkyl halides when reacts with alcohol?
a) Zn/HCl
b) PCl5
c) SOCl2/ Pyridine
d) PCl3

c) SOCl2/ Pyridine

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Which of the following is true about chlorobenzene?
a) Chlorobenzene is less reactive than benzyl chloride
b) Chlorobenzene is more reactive than ethyl bromide
c) Chlorobenzene is nearly as reactive as methyl chloride
d) Chlorobenzene is more reactive than isopropyl chloride

a) Chlorobenzene is less reactive than benzyl chloride

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What will be the product for the given reaction?
a) CCl3CHO
b) C6H6Cl6
c) C6H12Cl6
d) C6H9Cl2

b) C6H6Cl6

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Benzene reacts with chlorine to form benzene
hexachloride in presence of which of the following
reactant?
a) Nickel
b) AlCl3
c) Bright sunlight
d) Zinc

c) Bright sunlight

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What is the IUPAC name of chloroform?
a) Dichloromethane
b) Trichloromethane
c) Chloromethane
d) Carbon tetrachloride

b) Trichloromethane

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Which among the following is true?
a) Freon does not initiate radical chain reactions in
stratosphere
b) Iodoform initiates radical chain reactions in
stratosphere
c) Freon initiates radical chain reactions in stratosphere
d) Chloroform initiates radical chain reactions in
stratosphere

c) Freon initiates radical chain reactions in stratosphere

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Central nervous system can be depressed by the use of
which of the following:
a) Chloroform
b) Freon
c) Iodoform
d) DDT

a) Chloroform

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CFxCly [where x + y = 4], why these compounds are not
used?
a) These are fluoro carbons
b) These are difficult to synthesise
c) They deplete ozone layer
d) These are very expensive

c) They deplete ozone layer

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Which one of the following is the correct formula of
methylene dichloride?
a) ClCH = CHCl
b) ClC ≡ CCl
c) CH2Cl2
d) CH2(Cl) CH2Cl

c) CH2Cl2

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How Benzene hexachloride (BHC) is used?
a) Insecticides
b) Fertilizers
c) Anaesthetics
d) Antiseptics

a) Insecticides

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Which is the correct formula of Freon-12?
a) CCl2F2
b) CClF3
c) CHCl2F
d) CCl3F

a) CCl2F2

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Depletion of Ozone is believed to increase which of the
following?
a) Population
b) Ultraviolet rays
c) Pollution
d) Greenery

b) Ultraviolet rays

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Which of the following compounds does not give a
tertiary alcohol upon reaction with methylmagnesium
bromide?
a) 3-methylpentanal
b) Ethyl benzoate
c) 4,4-dimethylcyclohexanone
d) 4-heptanone

d) 4-heptanone

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2. Which is not present in Grignard reagent? a) Methyl group b) Magnesium c) Halogen d) −COOH group

d) −COOH group

1. Alkyl halides can be converted into Grignard reagents by a) Boiling them with Mg ribbon in alcoholic solution b) Warming them with magnesium powder in dry ether c) Refluxing them with MgCl2 solution d) Warming them with Mgcl2

b) Warming them with magnesium powder in dry ether

6. A Grignard’s reagent may be made by reacting magnesium with which of the following compound? a) Methyl amine b) Diethyl ether c) Ethyl iodide d) Ethyl alcohol

c) Ethyl iodide

4. Which of the following statements about Grignard reagent is false? a) Grignard reagents (RMgBr) add to the carbonyl group of aldehydes and ketones b) An organosodium compound is not very reactive compared to a Grignard reagent c) Grignard reagents are prepared in ether or tetrahydrofuran (THF) d) Grignard reagents are decomposed by water and alcohol

b) An organosodium compound is not very reactive compared to a Grignard reagent

5. Which of the following compounds gives a secondary alcohol upon reaction with methylmagnesium bromide? a) Butyl formate b) 3- pentanone c) Pentanal d) Methyl butanoate

c) Pentanal

9. Which of the following compounds would not give tert butyl alcohol when treated with excess methylmagnesium bromide? a) acetyl chloride b) acetaldehyde c) methyl acetate d) acetic anhydride

b) acetaldehyde

8. Which of the following reagents, when treated with phenylmagnesiuim bromide followed by acid workup, will yield 2-phenylethanol? a) Ethanol b) Diethyl ether c) Ethanal d) Oxirane

d) Oxirane

7. Which of the following compounds gives a primary alcohol upon reaction with phenylmagnesium bromide? a) 2-methyloxirane b) ethylene oxide c) ethyl formate d) carbon dioxide

b) ethylene oxide

8. Which of the following vinyl halide has industrial application? a) Vinyl fluoride b) Vinyl chloride c) Vinyl bromide d) Vinyl iodide

b) Vinyl chloride

2. Which of the following statement is incorrect about allylic halide? a) The positions adjacent to alkene C=C often show decrement in reactivity b) SN1 reactions of allylic halides are possible c) Allylic bonds are often weaker and therefore more easily broken d) stability of the allylic radical can be utilized in the preparation of allylic halides

c) Allylic bonds are often weaker and therefore more easily broken

5. Which of the following allylic halide has commercial usage? a) H2C = CH−CH2Cl b) H2C = CH−CH2Br c) H2C = CH−CH2I d) H2C = CH−CH2F

a) H2C = CH−CH2Cl

10. How can be a vinylic halide converted into Grignard reagent? a) Addition of base b) Addition of acid c) By adding magnesium d) Addition of diethyl ether

c) By adding magnesium

11. What will be the product when addition of hydrogen chloride to vinyl chloride occurs? a) 1,1-dichloroethane b) 1,2-dichloroethane c) 1-chloroethane d) 1-chloro 2,2-dichloroethane

a) 1,1-dichloroethane

1. Catalytic reduction (Hydrogenation) of carbon monooxide with H2 under high pressure and temperature gives methyl alcohol. What is this process is known as? a) Baeyer’s test b) Hofmann’s reaction c) Kolb process d) BASF process

d) BASF process

7. Acid catalysed hydration of alkenes except ethene leads to the formation of which of the following? a) Mixture of secondary and tertiary alcohols b) Mixture of secondary and tertiary alcohols c) Secondary or tertiary alcohol d) Primary alcohol

a) Mixture of secondary and tertiary alcohols

12. What will be the product for the given reaction? CH2 = CHC ≡ CH + HCl → ? vinylacetylene a) 2-chloro-1,3-dibutadiene b) 1,2-dichloro-1,3-dibutadiene c) 1-chloro-2,3-dibutadiene d) 3-chloro-1,2-dibutadiene

a) 2-chloro-1,3-dibutadiene

2. Which of the following statements is incorrect regarding preparation of alcohols? a) Aldehydes and Ketones on catalytic reduction by [H] give primary alcohol and secondary alcohol respectively b) Ketones on reaction with Grignard’s reagent gives tertiary alcohol c) Aldehydes on reaction with Grignard’s reagent gives primary or secondary alcohol d) Alkyl halides on reaction alcoholic potash gives alcohol

d) Alkyl halides on reaction alcoholic potash gives alcohol

3. Which of the following steps is not used in the fermentation of starch into ethyl alcohol? a) Hydrolysis of starch into maltose by diastase present in barley b) Conversion of maltose into glucose by maltase present in yeast c) Conversion of glucose into ethanol by zymase present in yeast d) Conversion of sucrose into glucose and fructose by sucrase present in yeast

d) Conversion of sucrose into glucose and fructose by sucrase present in yeast

9. Which of the following way is not a method of preparation of alcohol? a) Grignard reaction b) Reduction of an aldehyde, ketone, or carboxylic acid with the appropriate reducing agent c) Substitution reaction of hydroxide or water on the appropriate alkyl halide d) Haber’s process

d) Haber’s process

4. 15% pure ethyl alcohol (wash) on fractional distillation gives 95% ethyl alcohol by weight which is commonly known as which of the following terms? a) Wash b) Absolute alcohol c) Rectified spirit d) Methylated spirit

c) Rectified spirit

5. Ethyl alcohol obtained by fermentation of starch or molasses is called wash, and what is it’s purity? a) 15% b) 99% c) 99.9% d) 95%

a) 15%

6. Which is the only alcohol that can be prepared by the indirect hydration of alkene? a) Ethyl alcohol b) Propyl alcohol Answer: d c) Isobutyl alcohol d) Methyl alcohol

a) Ethyl alcohol

1. Which one of the following compound is obtained by the oxidation of primary alcohol with nascent oxygen? a) Alkanal b) Alkanone c) Ether d) Amine

a) Alkanal

8. Among the alkenes which one produces tertiary butyl alcohol on acid hydration? a) (CH3)2C=CH2 b) CH3-CH=CH-CH3 c) CH3CH2CH=CH2 d) CH3CH=CH2

a) (CH3)2C=CH2

10. Isopropyl methyl ether when treated with cold hydrogen iodide gives which of the following alcohol? a) isopropyl iodide and methyl iodide b) isopropyl alcohol and methyl iodide c) isopropyl alcohol and methyl alcohol d) isopropyl iodide and methyl alcohol

b) isopropyl alcohol and methyl iodide

3. Secondary alcohols on catalytic dehydrogenation by Cu Ni couple gives ___________ a) Ketone b) Aldehyde c) Carboxylic acid d) Amine

a) Ketone

2. Which one of the following compound is obtained by the oxidation of secondary alcohols by [O]? a) Ketone b) Aldehyde c) Ether d) Amine

a) Ketone

4. The reaction of carboxylic acids with alcohols catalysed by conc. H2SO4 is called __________ a) Dehydration b) Saponification c) Esterification d) Neutralization

c) Esterification

5. Which one is the correct order of reactivity of different types of alcohol towards hydrogen halide? a) 1° alcohol > 2° alcohol > 3° alcohol b) 2° alcohol > 1° alcohol > 3° alcohol c) 3° alcohol > 1° alcohol > 2° alcohol d) 3° alcohol > 2° alcohol > 1° alcohol

d) 3° alcohol > 2° alcohol > 1° alcohol

6. The dehydration of alcohols is an example of ________ a) Bimolecular elimination/E2 reaction b) SN2 reaction c) SN1 reaction d) Unimolecular elimination/E1 reaction

d) Unimolecular elimination/E1 reaction

7. Among the following, which is least acidic? a) Phenol b) O-cresol c) p-nitrophenol d) p- chlorophenol

b) O-cresol

10. The major reason that phenol is a better Bronsted acid than cyclohexanol is ____________ a) it is a better proton donor b) the cyclohexyl group is an electron donating group by induction, which destabilizes the anion formed in the reaction c) phenol is able to stabilize the anion formed in the reaction by resonance d) the phenyl group is an electron withdrawing group by induction, which stabilizes the anion formed in the reaction

c) phenol is able to stabilize the anion formed in the reaction by resonance

8. Which of the following alcohols would be most soluble in water? a) Propanol b) Hexanol c) Pentanol d) Butanol

a) Propanol

1. CH3OH is a which type of acid? a) Bronsted acid b) Lewis acid c) Arrhenius acid d) Lewis and Arrhenius acid

a) Bronsted acid

7. What is the correct order of acidic strength? a) CH3-OH b) CH3CH2-OH c) CH3 CH2 CH2-OH d) CH3 CH2 CH2 CH2-OH

a) CH3-OH

4. Which of the following is more acidic alcohol? a) Phenol b) Cyclohexanol c) Methanol d) Ethanol

a) Phenol

2. Which of the following is more acidic than alcohols? a) Arrhenius acid b) amine c) alkyne d) carboxylic acid

d) carboxylic acid

2. What is the IUPAC name for vinylic alcohol? a) Ethanol b) Methanol c) Ethenol d) Methenol

c) Ethenol

3. Which of the following is not an isomer of vinylic alcohol? a) Acetaldehyde b) Ethylene oxide c) Ethanol d) Ethanal

c) Ethanol

4. Which of the statement is not true about vinylic alcohols? a) Several metal complexes are known that contain vinyl alcohol as a ligand b) Vinyl alcohol was discovered in the molecular cloud Sagittarius B, using the 12-meter radio telescope c) It can be formed by elimination of water from ethylene glycol at a temperature of 900 °C and low pressure d) Vinylic alcohol shows no tautomerism

d) Vinylic alcohol shows no tautomerism

5. Polyvinyl alcohol is soluble in which solvent? a) protic b) aprotic c) polar aprotic d) polar protic

d) polar protic

3. What is the commercial method of preparation of phenol? a) Dows process b) From diazonium salt c) By decarboxylation of salicylic acid d) Hock method

d) Hock method

1. On heating aqueous solution of benzene diazonium chloride, which of the following is formed? a) benzene b) chlorobenzene c) phenol d) aniline

c) phenol

2. Sodium benzene sulphonate reacts with NaOH and then on acidic hydrolysis, it gives which of the following compound? a) Phenol b) Benzoic acid c) Benzene d) Disodium benzaldehyde

a) Phenol

4. Reaction of aqueous sodium hydroxide on chlorobenzene gives which of the following products? a) o-chlorophenol b) o-chlorophenol c) phenol d) no reaction

c) phenol

6. What is the reagent which will react with cumene to give phenol? a) Oxygen b) Hydrogen c) Nitrogen d) Ozone

a) Oxygen

8. What is the reactant ‘x’ and ‘y’ that will react with benzene to give phenol? a) X is Oleum and y is molten sodium hydroxide followed by H+ b) X is Oleum and y is HCl c) X is Oleum and y is NH3 d) X is Oleum and y is water

b) X is Oleum and y is HCl

1. Phenolphthalein is obtained by heating phenol with conc. H2SO4 and which of the following reactant? a) Benzyl alcohol b) Benzene c) Benzoic acid d) Phthalic anhydride

d) Phthalic anhydride

9. Which of the following is not a method for preparation of phenol? a) Dows process b) From diazonium salt c) By decarboxylation of salicylic acid d) By the decarboxylation of sodium benzoate

a) Dows process

10. Phenol is obtained by heating aqueous solution of which of the following? a) Aniline b) Benzene diazonium chloride c) Benzoic acid d) Benzyl alcohol

b) Benzene diazonium chloride

2. Salicylaldehyde can be prepared from which of the following reactants? a) Phenol and chloroform b) Phenol, chloroform and sodium hydroxide c) Phenol, carbon tetrachloride and NaOH d) Phenol, carbon tetrachloride

b) Phenol, chloroform and sodium hydroxide

3. When phenol is treated with excess of bromine water, it gives which of the following product? a) m-bromophenol b) o-and p-bromophenol c) 2,4-dibromophenol d) 2,4,6-tribromophenol

d) 2,4,6-tribromophenol

6. Which of the following regents may be used to distinguish between phenol and benzoic acid? a) Aqueous NaOH b) Tollen’s reagent c) Molisch reagent d) Neutral FeCl3

d) Neutral FeCl3

4. Phenol reacts with bromine in carbon disulphate at low temperature to give which of the following product? a) m-bromophenol b) o-and p-bromophenol c) p-bromophenol d) 2,4,6-tribromophenol

b) o-and p-bromophenol

5. Bromine reacts with phenol and decolorize orange color and turns it to which of the colored precipitate? a) white precipitate b) pink precipitate c) blue precipitate d) black precipitate

a) white precipitate

9. Bakelite is formed when phenol react with which of the following reactant? a) Formaldehyde b) Hydrogen c) Nitric acid d) Sulphuric acid

a) Formaldehyde

7. What is the major product obtained on interaction of phenol with sodium hydroxide and carbon dioxide? a) Benzoic acid b) Salicyladehyde c) Salicylic acid d) Phthalic acid

c) Salicylic acid

8. Picric acid is formed when phenol react with which of the following reactant? a) Formaldehyde b) Hydrogen c) Nitric acid d) Hydrochloric acid

c) Nitric acid

1. Chloroethane reacts with X to form diethyl ether. What is X? a) NaOH b) H2SO4 c) C2H5ONa d) Na2S2O3

c) C2H5ONa

10. Phenol undergoes ionization to become more stable by reacting with which of the following chemical species? a) negative ions b) positive ions c) radicals d) neutral atoms

a) negative ions

4. In which case would a Williamson ether synthesis fail? a) sodium ethoxide + iodomethane b) sodium ethoxide + iodoethane c) sodium ethoxide + 2-iodopropane d) sodium ethoxide + 2-iodo-2-methylpropane

d) sodium ethoxide + 2-iodo-2-methylpropane

2. The reaction given below is known as by which o the following reaction? C2H5ONa+IC2H5→C2H5OC2H5+NaI a) Kolbe’s synthesis b) Wurtz’s synthesis c) Williamson’s synthesis d) Grignard’s synthesis

c) Williamson’s synthesis

3. The Williamson ether synthesis produces ethers by reacting which of the following? a) alcohol with a metal b) alkoxide with a metal c) alkoxide with an alkyl halide d) alkyl halide with an aldehyde

c) alkoxide with an alkyl halide

5. Which of the following reagents should be used to prepare tert-butyl ethyl ether? a) tert-butyl bromide and sodium ethoxide b) tert-butyl alcohol and ethyl bromide c) tert-butyl alcohol and ethanol d) potassium tert-butoxide and ethyl bromide

d) potassium tert-butoxide and ethyl bromide

6. Which of the following reagents should be used to prepare tert-butyl propyl ether? a) 2-methylpropene and 1-propanol b) 2-methylpropene, acetic acid and 1-propanol c) 2-methylpropene, H2SO4 and 1-propanol d) 1-propyl bromide and tert-butyl alcohol

c) 2-methylpropene, H2SO4 and 1-propanol

7. What will be the reactant and reaction condition required for the given reaction? CH3CH2OH +? → C2H5OC2H5 a) H2SO4, 413K b) H2SO4, 443K c) HNO3, 413K d) HNO3, 443K

a) H2SO4, 413K

8. Which of the following is the method of preparation of ether? a) Dows process b) Williamson synthesis c) By decarboxylation of salicylic acid d) Hock method

b) Williamson synthesis

9. Williamson synthesis proceed visa which of the following mechanism? a) SN1 b) SN2 c) E1 d) E2

b) SN2

1. An ether is more volatile than an alcohol having the same molecular formula. What is the reason for this difference? a) dipolar character of ethers b) alcohols having resonance structures c) inter-molecular hydrogen bonding in ethers d) inter-molecular hydrogen bonding in alcohols

d) inter-molecular hydrogen bonding in alcohols

7. The boiling point of ethyl alcohol is much higher than that of dimethyl ether though both have the same molecular weight. Why? a) Ether is insoluble in water b) Methyl groups are attached to oxygen in ether c) Dipole moment of ethyl alcohol is less d) Ethyl alcohol shows hydrogen bonding

d) Ethyl alcohol shows hydrogen bonding

10. Which of the following is the commercial method of formation of ether? a) Dehydration of alcohol b) Williamson ether synthesis c) Ullmann condensation

b) Williamson ether synthesis

2. Ethers may be used as solvents because they react only with which of the following reactants? a) Acids b) Bases c) Oxidising agent d) Reducing agents

a) Acids

6. Select the ether among following that yields methanol as one of the products on reaction with cold hydroiodic acid. a) 1-Methoxybutane b) 1-Methoxy-2-methylpropane alcohol. We’ll have more about that to say in a few posts c) 2-Methoxy-2-methylpropane d) Methoxybenzene

c) 2-Methoxy-2-methylpropane

3. What are the products when ethyl isopropyl ether is cleaved with concentrated HI? a) ethanol and 2-iodo-2-methylpropane b) ethanol and 2-methylpropane c) iodoethane and isopropyl alcohol

c) iodoethane and isopropyl alcohol

4. What are the products when tert-butyl ethyl ether is cleaved with concentrated HI? a) iodoethane and tert-butanol b) iodoethane and 2-iodo-2-methylpropane c) ethanol and 2-iodo-2-methylpropane d) ethanol and tert-butanol

c) ethanol and 2-iodo-2-methylpropane

5. Which pair of products would result from the acid cleavage of phenyl propyl ether with excess concentrated HBr at an elevated temperature? a) Phenol and 1-propanol b) Bromobenzene and 1-propanol c) Bromobenzene and 1-bromopropane d) Phenol and 1-bromopropane

d) Phenol and 1-bromopropane

8. Which pair of products would result from the acid cleavage of tert-butyl propyl ether with excess concentrated HBr at an elevated temperature? a) tert-butyl bromide and propyl alcohol b) tert-butyl bromide and propyl bromide c) tert-butyl alcohol and propyl bromide d) 2-methyl-2-butene and propyl bromide

b) tert-butyl bromide and propyl bromide

10. Which of the following will be obtained by keeping ether in contact with air for a long time? a) C2H5−O−CH (CH3)−O−OH b) C2H5−OCH2−OH c) C2H5−O−C2H5OH d) CH3−O CH (CH3)−O−OH

d) CH3−O CH (CH3)−O−OH

Halogen Containing Organic Compounds Flashcards

(102 cards)