Alkenes and Alkynes: Interactive Learning Quizzes for Year 13 Chemistry

Question 1

Which reaction is NOT a typical characteristic of alkenes?

Accepted Answer

Oxidation with potassium permanganate

Answer

Addition of hydrogen

Answer

Addition of water

Answer

Addition of bromine

Question 2

Identify the branched alkene among the given options:

Accepted Answer

2-Methylpropene

Answer

Ethene

Answer

Propene

Answer

1-Butene

Question 3

Which compound among the following is an alkyne?

Accepted Answer

Butyne

Answer

Ethane

Answer

Propene

Answer

Pentene

Question 4

Which reagent reacts with an alkene to form an epoxide?

Accepted Answer

Peroxyacid (RCO3H)

Answer

Potassium permanganate (KMnO4)

Answer

Sulfuric acid (H2SO4)

Answer

Sodium hydroxide (NaOH)

Question 5

Which alkene has the lowest boiling point?

Accepted Answer

Ethene (C2H4)

Answer

Propene (C3H6)

Answer

Butene (C4H8)

Answer

Pentene (C5H10)

Question 6

Which reaction is an example of hydroboration-oxidation?

Accepted Answer

Reaction of an alkyne with borane (BH3) followed by oxidation

Answer

Addition of water (H2O) to an alkene

Answer

Addition of hydrogen chloride (HCl) to an alkyne

Answer

Reaction of an alkene with a peroxyacid

Question 7

What is the IUPAC name of the alkene with the molecular formula CH3CH(CH3)CH=CH2?

Accepted Answer

2-Methylpropene

Answer

1-Methylpropene

Answer

1-Butene

Answer

2-Butene

Question 8

Which characteristic is true of alkenes?

Accepted Answer

Undergo electrophilic addition reactions

Answer

Are saturated hydrocarbons

Answer

Have a triple carbon-carbon bond

Answer

Are less reactive than alkanes

Question 9

What is the product of the following reaction: CH3-C≡C-CH3 + H2/Lindlar

Accepted Answer

CH3-CH=CH-CH3

Answer

CH3-CH2-CH=CH2

Answer

CH3-CH2-CH2-CH3

Answer

CH3-C=C-CH3

Question 10

What is the major product of the reaction between CH3-CH=CH-CH3 and HBr?

Accepted Answer

2-Bromobutane

Answer

1-Bromobutane

Answer

2-Bromopropane

Answer

1-Bromopropane

Question 11

Which of the following alkenes is the most stable?

Accepted Answer

2-Methylpropene

Answer

Ethene

Answer

Propene

Answer

2-Butene

Question 12

What is the geometry around the carbon atoms involved in the double bond of an alkene?

Accepted Answer

Trigonal Planar

Answer

Tetrahedral

Answer

Trigonal Pyramidal

Answer

Linear

Question 13

Which of the following is not a characteristic reaction of alkynes?

Accepted Answer

Substitution of a hydrogen atom

Answer

Addition of hydrogen

Answer

Addition of halogens

Answer

Polymerization

Question 14

The hybridization of the carbon atoms involved in the double bond of an alkene is:

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 15

The name of the reaction in which an alkene reacts with water in the presence of a strong acid is:

Accepted Answer

Hydration

Answer

Hydrolysis

Answer

Polymerization

Answer

Esterification

Question 16

The type of reaction in which CH3CH=CH2 + H2 → CH3CH2CH3 is classified as:

Accepted Answer

Addition

Answer

Elimination

Answer

Substitution

Answer

Rearrangement

Question 17

What is the hybridization of the carbon atoms in ethene?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 18

Which of the following is a structural isomer of butene?

Accepted Answer

2-methylpropene

Answer

Pentane

Answer

Propene

Answer

Cyclobutane

Question 19

Which of the following reagents could be used to convert an alkyne to an alkane?

Accepted Answer

Hydrogen gas in presence of a catalyst

Answer

Sodium hydroxide

Answer

Potassium permanganate

Answer

Bromine water

Question 20

Which of the following is a polymer made from an alkene?

Accepted Answer

Polyethylene

Answer

Polystyrene

Answer

Polyvinyl chloride

Answer

Polytetrafluoroethylene

Question 21

What is the molecular formula of a cyclic alkene with 6 carbon atoms?

Accepted Answer

C6H10

Answer

C6H12

Answer

C5H10

Answer

C5H12

Question 22

Specify the hybridization of the carbon atoms involved in the double bond of an alkene.

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 23

Identify the characteristic reaction of alkenes.

Accepted Answer

Electrophilic addition

Answer

Addition of hydrogen

Answer

Nucleophilic substitution

Answer

Polymerization

Question 24

Determine the major product formed when 2-methylpropene reacts with hydrogen bromide.

Accepted Answer

1-bromo-2-methylpropane

Answer

2-bromo-2-methylpropane

Answer

2-bromo-1-methylpropane

Answer

1-bromo-1-methylpropane

Question 25

Identify the alkene that would undergo the most rapid electrophilic addition reaction.

Accepted Answer

2,3-dimethyl-2-butene

Answer

Ethene

Answer

Propene

Answer

2-methylpropene

Question 26

Name the reaction in which an alkyne is converted to an alkene.

Accepted Answer

Hydrogenation

Answer

Hydration

Answer

Hydrohalogenation

Answer

Oxidation

Question 27

Specify the reaction used to synthesize alkynes.

Accepted Answer

Elimination

Answer

Substitution

Answer

Addition

Answer

Rearrangement

Question 28

Which of the following statements accurately describes the structure of alkenes?

Accepted Answer

They contain at least one double bond between carbon atoms.

Answer

They are saturated hydrocarbons.

Answer

They undergo substitution reactions, such as halogenation.

Answer

They are always cyclic.

Question 29

What is the hybridization of the carbon atoms involved in the triple bond of an alkyne?

Accepted Answer

sp

Answer

sp2

Answer

sp3

Answer

sp3d

Question 30

Which of the following reactions exemplifies an electrophilic addition reaction?

Accepted Answer

Alkenes reacting with bromine water

Answer

Alkenes reacting with hydrogen gas in the presence of a nickel catalyst

Answer

Alkenes reacting with sodium borohydride

Answer

Alkenes reacting with potassium permanganate

Question 31

What is the hybridization of the carbon atoms in the double bond of an alkene?

Accepted Answer

sp2 (trigonal planar geometry)

Answer

sp (linear geometry)

Answer

sp3 (tetrahedral geometry)

Answer

sp3d (trigonal bipyramidal geometry)

Question 32

What is the name of the following compound: CH3-CH=CH-CH=CH2?

Accepted Answer

1,3-pentadiene (correct: this is a straight-chain alkene with two double bonds separated by a single bond)

Answer

1-pentene (incorrect: this is a straight-chain alkene with one double bond)

Answer

1,4-pentadiene (incorrect: this is a straight-chain alkene with two double bonds separated by two single bonds)

Answer

2-pentene (incorrect: this is a branched-chain alkene with one double bond)

Question 33

What is the main product of the reaction of an alkene with hydrogen chloride?

Accepted Answer

An alkyl chloride (formed by the electrophilic addition of hydrogen chloride to the alkene)

Answer

An alkene chloride (incorrect: this is not a stable product)

Answer

An alkyne chloride (incorrect: this is not a possible product)

Answer

A cycloalkane (incorrect: this is not a possible product)

Question 34

Which of the following compounds is an example of an alkyne?

Accepted Answer

CH3-CH2-C≡CH (alkyne)

Answer

CH3-CH2-CH=CH2 (alkene)

Answer

CH3-CH2-CH2-OH (alcohol)

Answer

CH3-CH2-COOH (carboxylic acid)

Question 35

Which of the following reagents can be used to reduce an alkyne to an alkane?

Accepted Answer

Hydrogen gas in the presence of a palladium catalyst (catalytic hydrogenation)

Answer

Sodium borohydride (incorrect: this is a reducing agent for aldehydes and ketones)

Answer

Lithium aluminum hydride (incorrect: this is a stronger reducing agent than is typically used for alkynes)

Answer

Potassium permanganate solution (incorrect: this is an oxidizing agent)

Question 36

What type of reaction is the combustion of an alkene?

Accepted Answer

Redox (correct, as combustion involves both oxidation and reduction reactions)

Answer

Addition (not correct, as combustion involves the breaking of bonds)

Answer

Elimination (not correct, as combustion does not involve the removal of small molecules)

Answer

Substitution (not correct, as combustion does not involve the replacement of atoms or groups)

Question 37

Which of the following is an alkyne?

Accepted Answer

CH3-C≡CH

Answer

CH3-CH=CH2

Answer

CH3-CH2-CH2-OH

Answer

CH3-COOH

Question 38

What is the major product of the following reaction: CH3-CH=CH2 + HCl?

Accepted Answer

CH3-CHCl-CH3

Answer

CH2Cl-CH2-CH3

Answer

CH3-CH=CHCl

Answer

CH2=CH-CH2Cl

Question 39

Which of the following is a suitable reagent for the reduction of an alkyne to an alkene?

Accepted Answer

H2/Lindlar's catalyst

Answer

LiAlH4

Answer

NaBH4

Answer

KMnO4

Question 40

What is the hybridization of the carbon atoms in the triple bond of an alkyne?

Accepted Answer

sp

Answer

sp2

Answer

sp3

Answer

sp3d2

Question 41

According to Cahn-Ingold-Prelog (CIP) rules, which functional group has the highest priority?

Accepted Answer

Alkyne

Answer

Aldehyde

Answer

Alkene

Answer

Alcohol

Question 42

Propene can be converted to propene-1,2-diol. Which oxidizing agent is typically used for this conversion?

Accepted Answer

Potassium permanganate

Answer

Sodium hydroxide

Answer

Hydrogen peroxide

Answer

Hydrochloric acid

Question 43

What is the initial step in the electrophilic addition of hydrogen bromide to propyne?

Accepted Answer

Protonation of the triple bond

Answer

Formation of a carbocation intermediate

Answer

Nucleophilic attack on the triple bond

Answer

Rearrangement of the triple bond

Question 44

But-1-yne reacts with sodium amide to form a product with a carbon-carbon triple bond. What type of reaction occurs?

Accepted Answer

Nucleophilic addition

Answer

Electrophilic addition

Answer

Dehydrohalogenation

Answer

Substitution

Question 45

What is the hybridization of the carbon atoms participating in the double bond of an alkene?

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 46

What is the primary product obtained when ethyne undergoes catalytic hydrogenation?

Accepted Answer

Ethane

Answer

Ethylene

Answer

Acetylene

Answer

Propene

Question 47

Which functional group is characteristic of alkynes?

Accepted Answer

Carbon-carbon triple bond

Answer

Carbon-carbon double bond

Answer

Carbon-oxygen double bond

Answer

Carbon-nitrogen double bond

Question 48

What is the major product of the following reaction: CH3CH=CHCH2 + HBr?

Accepted Answer

CH3CH(Br)CH2CH3

Answer

CH3CH2CH(Br)CH3

Answer

CH3CH=CHCH2Br

Answer

CH3CH2CH2CH2Br

Question 49

What is the product of the following reaction: HC≡CH + 2H2 (Lindlar's catalyst)?

Accepted Answer

cis-CH=CH

Answer

CH3CH3

Answer

CH2=CH2

Answer

trans-CH=CH

Question 50

Which of the following functional groups is characteristic of alkynes?

Accepted Answer

C≡C

Answer

C=C

Answer

C-O

Answer

C-N

Question 51

What is the IUPAC name of the following compound: CH3CH=C(CH3)2?

Accepted Answer

3-Methylbut-1-ene

Answer

2-Methylprop-1-ene

Answer

2-Methylbut-2-ene

Answer

3-Methylprop-1-ene

Question 52

Which of the following reactions can be used to prepare alkynes?

Accepted Answer

Elimination of a hydrogen halide from an alkyl halide

Answer

Dehydration of an alcohol

Answer

Reduction of an alkyne

Answer

Oxidation of an alkene