Alkenes and Alkynes: Structure, Properties, and Reactions - Chemistry Quiz

Question 1

Define the characteristic structural feature of alkenes.

Accepted Answer

They contain one or more carbon-carbon double bonds.

Answer

They contain at least one carbon-carbon triple bond.

Answer

They are saturated hydrocarbons.

Answer

They contain only single bonds.

Question 2

Identify the product formed when hydrogen gas is added to an alkyne in the presence of a metal catalyst.

Accepted Answer

An alkane

Answer

An alkene

Answer

An alcohol

Answer

A ketone

Question 3

Determine the hybridization state of the carbon atoms involved in a carbon-carbon double bond.

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 4

Identify the reaction that is characteristic of alkynes but not alkenes.

Accepted Answer

Polymerization

Answer

Nucleophilic addition of Grignard reagents

Answer

Addition of water in the presence of sulfuric acid

Answer

Electrophilic addition of hydrogen halides

Question 5

Identify the starting material required for the preparation of an alkyne through the elimination reaction.

Accepted Answer

An alkyl halide

Answer

An alkane

Answer

An alkene

Answer

An alcohol

Question 6

Which property is NOT characteristic of alkenes and alkynes?

Accepted Answer

C. Soluble in water

Answer

A. Contain at least one double or triple bond

Answer

B. Undergo combustion reactions

Answer

D. Unsaturated hydrocarbons

Question 7

To investigate the relative reactivity of alkenes in electrophilic addition reactions, design an experiment. Describe the materials, procedures, and data analysis techniques you would employ.

Accepted Answer

Utilize various alkenes with varying substitution levels and a consistent electrophile.

Answer

Employ a single alkene and alter the electrophile concentration.

Answer

Use a single alkene and experiment with various electrophiles.

Question 8

Which of the following functional groups is characteristic of alkenes and distinguishes them from alkanes?

Accepted Answer

C=C

Answer

Carbonyl

Answer

Hydroxyl

Answer

Amine

Question 9

Which of the following reactions is most characteristic of alkenes?

Accepted Answer

Addition

Answer

Substitution

Answer

Oxidation

Answer

Polymerization

Question 10

What is the major product of the addition of hydrogen (H2) to an alkene?

Accepted Answer

Alkane

Answer

Alkyl halide

Answer

Alcohol

Answer

Aldehyde

Question 11

Which of the following reagents is commonly used to test for the presence of an alkene?

Accepted Answer

Bromine water

Answer

Sodium hydroxide

Answer

Potassium permanganate

Answer

Silver nitrate

Question 12

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

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 13

Which of the following alkenes is generally the most stable?

Accepted Answer

2-Methylpropene

Answer

Ethene

Answer

Propene

Answer

1-Butene

Question 14

Which of the following is a common example of an alkyne?

Accepted Answer

Acetylene

Answer

Ethylene

Answer

Propane

Answer

Butane

Question 15

What type of hybridization do the carbon atoms in the triple bond of an alkyne have?

Accepted Answer

sp

Answer

sp2

Answer

sp3

Answer

sp3d

Question 16

In an alkene, the carbon atoms in the double bond are hybridized as:

Accepted Answer

sp2

Answer

sp3

Answer

sp

Answer

sp3d

Question 17

Which reagent can be employed to distinguish alkenes from alkanes?

Accepted Answer

Potassium permanganate solution

Answer

Hydrochloric acid

Answer

Tollens' reagent

Answer

Sodium hydroxide solution

Question 18

During acid-catalyzed hydration of propene, the primary product is:

Accepted Answer

1-propanol

Answer

2-propanol

Answer

propene oxide

Answer

propanal

Question 19

Which method can be used to synthesize an alkyne?

Accepted Answer

Elimination reaction of a vicinal dihalide

Answer

Hydrolysis of an alkyne

Answer

Alkylation of an alkyne

Answer

Oxidation of an alkene

Question 20

Which type of intermolecular force is the dominant force in alkenes?

Accepted Answer

Van der Waals forces

Answer

Hydrogen bonding

Answer

Dipole-dipole forces

Answer

Ion-dipole forces

Question 21

The characteristic functional group shared by both alkenes and alkynes is:

Accepted Answer

C=C

Answer

C=O

Answer

-OH

Answer

-COOH

Question 22

Identify the hybridization of the carbon atoms in the double bond of an alkene:

Accepted Answer

sp2

Answer

sp

Answer

sp3

Answer

sp3d

Question 23

Which functional group reacts with electrophilic addition reactions?

Accepted Answer

Alkenes

Answer

Alkanes

Answer

Alkynes

Answer

Arenes

Question 24

Explain the mechanism of the acid-catalyzed hydration of an alkene:

Accepted Answer

Electrophilic addition followed by nucleophilic addition

Answer

Nucleophilic addition followed by electrophilic addition

Answer

Radical addition

Answer

Pericyclic reaction

Question 25

How do positional and geometric isomerism in alkenes and alkynes influence their physical properties, like boiling and melting points?

Accepted Answer

Both positional and geometric isomers can affect physical properties.

Answer

Only positional isomers impact physical properties.

Answer

Isomerism has no effect on physical properties.

Answer

Only geometric isomers affect physical properties.

Question 26

Which statement accurately describes the relative stability of alkenes?

Accepted Answer

Internal alkenes are more stable than terminal alkenes due to less steric hindrance.

Answer

Terminal alkenes are more stable than internal alkenes due to resonance stabilization.

Answer

All alkenes have the same stability regardless of their structure.

Answer

The stability of alkenes cannot be compared without additional information.

Question 27

Which of the following reactions is unique to alkynes and not characteristic of alkenes?

Accepted Answer

Diels-Alder cycloaddition with conjugated dienes

Answer

Electrophilic addition of hydrogen halides

Answer

Nucleophilic addition of water

Answer

Combustion in the presence of oxygen

Question 28

What is the final product of the reaction of an alkyne with ozone (O3) followed by hydrolysis?

Accepted Answer

Dialdehyde and diol

Answer

Alkene and water

Answer

Aldehyde and ketone

Answer

Carboxylic acid and alcohol

Question 29

Which reagent can be used to distinguish between an alkene and an alkyne?

Accepted Answer

Potassium permanganate

Answer

Bromine water

Answer

Silver nitrate

Answer

Sodium borohydride

Question 30

Which mechanism accurately describes the addition of hydrogen chloride (HCl) to an alkene?

Accepted Answer

Electrophilic addition

Answer

Nucleophilic addition

Answer

Radical addition

Answer

Carbocation addition

Question 31

Alkenes are hydrocarbons that contain:

Accepted Answer

One or more double bonds between carbon atoms

Answer

One or more triple bonds between carbon atoms

Answer

One or more single bonds between carbon atoms

Answer

Aromatic rings

Question 32

Which of the following reactions is typical of alkenes?

Accepted Answer

Addition reaction

Answer

Elimination reaction

Answer

Substitution reaction

Answer

Rearrangement reaction

Question 33

The product of the addition of hydrogen to an alkene is a:

Accepted Answer

Alkane

Answer

Alcohol

Answer

Alkene

Answer

Alkyne

Question 34

Which of the following is the major product of the elimination reaction of 2-bromobutane?

Accepted Answer

But-2-ene

Answer

1-Bromobutene

Answer

2-Bromobutene

Question 35

Alkenes are generally more reactive than alkanes because:

Accepted Answer

They have a double bond, which is more reactive than a single bond

Answer

They have a higher boiling point than alkanes

Answer

They are less dense than alkanes

Question 36

Which of the following functional groups is present in alkynes?

Accepted Answer

Triple bond

Answer

Double bond

Answer

Ether group

Answer

Alcohol group

Question 37

Alkynes can undergo:

Accepted Answer

Both addition and elimination reactions

Answer

Only elimination reactions

Answer

Only addition reactions

Question 38

Alkynes are used as starting materials for the production of:

Accepted Answer

Pharmaceuticals and plastics

Answer

Carboxylic acids and esters

Answer

Aldehydes and ketones

Answer

Alcohols and ethers

Question 39

What is the name of the functional group that contains a carbon-carbon double bond?

Accepted Answer

Alkene

Answer

Alkyne

Answer

Alkane

Answer

Alcohol

Question 40

Which type of reaction is characteristic of alkenes and alkynes?

Accepted Answer

Addition reaction

Answer

Substitution reaction

Answer

Esterification reaction

Answer

Condensation reaction

Question 41

What is the major product of the reaction: CH₂=CH₂ + HBr → ?

Accepted Answer

CH₃CH₂Br

Answer

C₂H₆

Answer

CHBr=CH₂

Answer

CH₂BrCH₂

Question 42

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

Accepted Answer

sp²

Answer

sp

Answer

sp³d

Answer

sp³

Question 43

Which molecule has the lowest boiling point?

Accepted Answer

Ethene

Answer

Propene

Answer

2-Butene

Answer

1-Butene

Question 44

What is the name of the reaction that converts an alkene to an alkyne?

Accepted Answer

Dehydrohalogenation

Answer

Hydrogenation

Answer

Oxidation

Answer

Hydrohalogenation