Organic Chemistry

Question 1

Bromine solution+carbon tetrachloride+alkene

Answer 1

Brown coloured bromine discharged and addition product is also formed

Question 2

Alkane KMnO4+alkyne

Answer 2

Purple colour discharged as addition product is formed.

Question 4

Ammoniacal Cuprous chloride+alkene

Answer 4

No precipitate formed

Question 5

Carboxylic acid+blue litmus sol.(shake the test tube)

Answer 5

Sol.turns red

Question 6

Alkane KMnO4+alkane

Answer 6

Purple colour persists as no addition product formed

Question 7

Ammoniacal Cuprous chloride+alkyne

Answer 7

Red precipitate of copper acetylide is formed

Question 8

Alcohol +litmus solution

Answer 8

The colour of litmus unchanged when alcohol is added.

Alcohols are neutral to litmus.

Question 9

Acetylene dichloride

Answer 9

Used as a solvent

Question 10

Alcohol +acetic acid+drops of conc. Sulphuric acid

Answer 10

A sweet smelling ester formed indicating the presence of alcoholic group in the compound

Question 12

5ml of alcohol +sodium metal

Answer 12

An effervescence due to the evolution of hydrogen gas indicates the presence of alcoholic group.

Question 13

Carboxylic acid+saturated solution of sodium bicarbonate

Answer 13

A brisk effervescence with the evolution of carbon dioxide

Question 14

Ethylene oxide

Answer 14

Used as a fumigant(disinfectant)

Question 16

Carboxylic acid+ethanol+conc. Sulphuric acid

Answer 16

Sweet smelling vapours

Question 17

Carbon black

Answer 17

A pigment in shoe polish,printers ink

Question 18

Chloroform

Answer 18

Used as an anaesthesia,solvent for rubber and waxes.

Question 19

Methanol

Answer 19

Solvent for varnishes,anti-freeze for automobiles

Question 20

Ethanol

Answer 20

Solvent for resins,thermometric fluid(low freezing point)

Question 21

Formaldehyde

Answer 21

Used in preservation of biological specimens

Question 22

Acetaldehyde

Answer 22

Used in the manufacture of dyes

Question 23

Ethylene glycol

Answer 23

Used as an anti-freezer

Question 24

Ethyl alcohol

Answer 24

Alcoholic beverages,drugs,antiseptic

Question 25

Di-ethyl ether

Answer 25

Used as a solvent

Question 27

Oxalic acid

Answer 27

Used for removing ink stains

Question 29

Which was the first organic compound discovered?

Answer 29

Urea
CO(NH2)2
:::was discovered by Friedrich Wohler.

Question 30

What is the vital force theory given by Jacob Berzelius?

Answer 30

Organic compounds were produced by nature under a mysterious force force called the 'vital force'.

Question 31

What is catenation?

Answer 31

It is the unique property of carbon atoms to link with each other carbon atoms to form: - straight chain compounds - branched chain compounds - closed ring chain compounds

Question 32

What is isomerism?

Answer 32

Organic compounds having the same molecular formula but different structural formula are called isomers and this property is known as isomerism.

Question 33

``` CH3 CH3 \ / C=C / \ H H Identify the structure. ```

Answer 33

Cis-butane

Question 34

``` CH3 H \ / C=C / \ H CH3 Identify the structure ```

Answer 34

trans-butane

Question 35

Draw the example of a chain isomerism.

Answer 35

CH3-CH2-CH2-CH2-CH2-CH2-CH3 OR CH3-CH2-CH2-CH2-CH2-CH3 | CH3

Question 36

CH3-CH2-CH2-CH=CH-CH2-CH3 What type of isomerism does this show?

Answer 36

Position isomerism

Question 37

Why do Alkanes only undergo substitution reaction?

Answer 37

Here all the bonds are fully utilised and they cannot take up more hydrogen.

Question 38

What is the general formula of alkanes

Answer 38

CnH 2n+2

Question 39

What is the general formula of alkene?

Answer 39

Cn H2n

Question 40

What is the general formula of alkynes?

Answer 40

CnH2n-2

Question 43

Acetic acid

Answer 43

Manufacture of polyvinyl acetate,vinegar

Question 46

Bromine solution+carbon tetrachloride+alkyne

Answer 46

Brown coloured bromine discharged as addition product is also formed

Question 56

Ammoniacal Cuprous chloride+alkane

Answer 56

No precipitate formed

Question 61

Alkane KMnO4+alkene

Answer 61

Purple colour discharged due to addition product formed.

Question 64

Bromine solution+carbon tetrachloride+alkane

Answer 64

No change is observed as no addition product formed