WA 1 Alkane, Alkene And Arenes

Question 1

What is the general formula for alkanes?

Answer 1

C_nH_2n+2

Question 2

True or False: Arenes are cyclic compounds containing alternating double bonds.

Answer 2

True

Question 3

What is the main functional group of alkenes?

Answer 3

Alkene group (C=C)

Question 4

True or False: Alkanes are saturated hydrocarbons.

Answer 4

True

Question 5

What is the process called that converts alkenes into alkanes?

Answer 5

Hydrogenation

Question 6

What is the general formula for cycloalkanes?

Answer 6

C_nH_2n

Question 7

Which compound is a structural isomer of butane?

Answer 7

Isobutane

Question 8

What type of reaction do alkenes typically undergo?

Answer 8

Electrophilic addition

Question 9

What is the main characteristic of aromatic compounds?

Answer 9

Stability due to resonance

Question 10

What is the hybridization of carbon in alkenes?

Answer 10

sp2

Question 11

True or False: Alkanes can undergo substitution reactions.

Answer 11

True

Question 12

Fill in the blank: The reaction of benzene with bromine in the presence of a catalyst is an example of ______.

Answer 12

Electrophilic substitution

Question 13

What is the bond angle in alkenes?

Answer 13

120 degrees

Question 14

Which type of isomerism is observed in alkenes?

Answer 14

Geometric isomerism (cis-trans)

Question 15

What is the main product of the complete combustion of alkanes?

Answer 15

Carbon dioxide and water

Question 16

What is the common name for C6H6?

Answer 16

Benzene

Question 17

Which reaction involves the addition of hydrogen halides to alkenes?

Answer 17

Hydrohalogenation

Question 18

True or False: Alkenes are more reactive than alkanes.

Answer 18

True

Question 19

What type of bond connects benzene’s carbon atoms?

Answer 19

Sigma and pi bonds

Question 20

Fill in the blank: The reaction of an alkene with water is called ______.

Answer 20

Hydration

Question 21

What is the main difference between aliphatic and aromatic compounds?

Answer 21

Aromatic compounds contain a benzene ring.

Question 22

True or False: Alkenes can participate in polymerization reactions.

Answer 22

True

Question 23

What is the hybridization of carbon in alkanes?

Answer 23

sp3

Question 24

Fill in the blank: The process of breaking down alkanes into smaller molecules is called ______.

Answer 24

Cracking

Question 25

Which type of reaction do alkanes typically undergo?

Answer 25

Substitution reactions

Question 26

What is the term for compounds with the same molecular formula but different structural formulas?

Answer 26

Isomers

Question 27

What is the effect of branching on the boiling point of alkanes?

Answer 27

It decreases the boiling point.

Question 28

True or False: Benzene is a saturated hydrocarbon.

Answer 28

False

Question 29

What type of reaction is an elimination reaction?

Answer 29

A reaction that involves the removal of atoms or groups from a molecule.

Question 30

Fill in the blank: The addition of bromine to an alkene is an example of ______.

Answer 30

Electrophilic addition

Question 31

Which of the following is a characteristic of aromatic compounds?

Answer 31

They exhibit resonance.

Question 32

True or False: Alkenes can undergo combustion reactions.

Answer 32

True

Question 33

What is the bond angle in alkanes?

Answer 33

109.5 degrees

Question 34

What is the main product of incomplete combustion of hydrocarbons?

Answer 34

Carbon monoxide

Question 35

What is the term for the process of adding hydrogen to an alkene?

Answer 35

Hydrogenation

Question 36

Fill in the blank: The reaction of an alkene with a halogen is called ______.

Answer 36

Halogenation

Question 37

What is the main characteristic of alkanes?

Answer 37

They are saturated hydrocarbons.

Question 38

True or False: All alkenes are unsaturated hydrocarbons.

Answer 38

True

Question 39

What is the hybridization of the carbon atoms in benzene?

Answer 39

sp2

Question 40

What type of hydrocarbon is cyclohexane?

Answer 40

Cyclic alkane

Question 41

What is the IUPAC name for C₆H₁₂?

Answer 41

Hexene

Question 42

Which of the following reactions is characteristic of alkenes?

Answer 42

Addition reactions

Question 43

True or False: Aromatic compounds follow Huckel's rule.

Answer 43

True

Question 44

What is the term for a hydrocarbon with only single bonds?

Answer 44

Saturated hydrocarbon

Question 45

What type of reaction can benzene undergo?

Answer 45

Electrophilic substitution

Question 46

True or False: Alkenes are less reactive than alkanes.

Answer 46

False

Question 47

Fill in the blank: The reaction of alkenes with water in acid is called ______.

Answer 47

Hydration

Question 48

True or False: Alkenes can form polymers.

Answer 48

True

Question 49

True or False: Alkanes are generally more reactive than alkenes.

Answer 49

False

Question 50

What is the molecular formula for cyclohexene?

Answer 50

C6H10

Question 51

Fill in the blank: The process of adding a halogen to an alkene is called ______.

Answer 51

Halogenation

Question 52

What is the bond angle around carbon atoms in alkanes?

Answer 52

109.5 degrees

Question 53

What is the primary product of the combustion of alkenes?

Answer 53

Carbon dioxide and water

Question 54

True or False: Aromatic compounds are always unsaturated.

Answer 54

True

Question 55

What are the reagents and conditions to form an alkane from an alkene? And what kind of reaction is this?

Answer 55

(1) H₂ gas, Ni catalyst, high temp & pressure OR (2) H₂ gas, Pd or Pt catalyst Reduction

Question 56

What are the reagents and conditions to form a halogenalkane (C_nH_2n+1X) from an alkane? What type of reaction is this?

Answer 56

**Limited** Cl₂ or Br₂ and UV light **Free Radical Substitution**

Question 57

What are the products formed from complete and incomplete combustion of an alkane?

Answer 57

Complete (**Excess** O₂): CO₂ + H₂O Incomplete (**Limited** O₂): CO + H₂O

Question 58

What are the products formed from complete and incomplete combustion of an alkane?

Answer 58

Complete (Excess O₂): CO₂ + H₂O Incomplete (Limited O₂): CO + H₂O

Question 59

What are the reagents and conditions to from an alkene from a halogenoalkane? What type of reaction is this?

Answer 59

(1)Alcoholic KOH, heat OR (2) NaOH in ethanol, heat **Elimination** Apply Saytzeff’s Rule to predict the location of the double bond

Question 60

What are the reagents and conditions to form an alkene from an alcohol? What type of reaction is this?

Answer 60

(1) Excess conc. H₂SO₄, heat OR (2) Excess conc. H₃PO₄, heat OR (3) Al₂O₃, heat **Elimination** (Apply Saytzeff’s Rule)

Question 61

What are the reagents and conditions to form alcohol from alkenes? What type of reaction is this?

Answer 61

(1) Steam, high temp and pressure, conc. H₃PO₄ catalyst OR (2) Cold conc. H₂SO₄ followed by hot water **Electrophilic Addition** (Apply Markovnikov’s Rule to predict the location of the -OH group)

Question 62

What are the reagents and conditions to form a mono substituted halogenoalkane from an alkene? What type of reaction is this?

Answer 62

(1) Dry HX(g) OR (2) HX in CCl₄ **Electrophilic Addition** (Apply Markovnikov’s Rule)

Question 63

What are the reagents and conditions to form an halogeno-alcohol from an alkene? What type of reaction is this?

Answer 63

**Aqueous** X₂ **Electrophilic Addition** (Apply Markovnikov’s Rule)

Question 64

What are the reagents and conditions to form a di-substituted halogenoalkane from an alkene? What type of reaction is this?

Answer 64

(1) X₂ in CCl₄ in the dark OR (2) X₂ (g or l) in the dark **Electrophilic Addition**

Question 65

What are the different products formed alcohols under different oxidative conditions? What are the reagents and conditions?

Answer 65

**Strong Oxidation**: (1) Hot acidified KMnO₄ OR (2) Hot alkaline KMnO₄ Cleaves the C=C double bonds *Terminal* Carbons form *CO₂ + H₂O* *Primary* Carbons form *Carboxylic acids* *Secondary* Carbons form *Ketones* **Mild Oxidation**: **Cold** alkaline KMnO₄ Forms *Diols* (No cleavage occurs)

Question 66

What are the different products formed alcohols under different oxidative conditions? What are the reagents and conditions?

Answer 66

**Strong Oxidation**: (1) Hot acidified KMnO₄ OR (2) Hot alkaline KMnO₄ Cleaves the C=C double bonds *Terminal* Carbons form *CO₂ + H₂O* *Primary* Carbons form *Carboxylic acids* *Secondary* Carbons form *Ketones* **Mild Oxidation**: **Cold** alkaline KMnO₄ Forms *Diols* (No cleavage occurs)

Question 67

What are the reagents and conditions to form Nitrobenzene (C₆H₅NO₂) from Benzene? What type of reaction is this?

Answer 67

Conc. HNO_{3 and conc. H2SO4, 55ºC **Electrophilic Substitution**}

Question 68

What are the reagents and conditions to form Halogenoarenes(C₆H₅X) from Benzene? What type of reaction is this?

Answer 68

(1) X₂ with Anhydrous FeX₃ OR (2) X₂ with AlX₃ and Fe catalyst **Electrophilic Substitution** Note X = Cl or Br