Alkanes and Cycloalkanes: Structure, Properties, and Reactions

Question 1

Generally, as the molecular mass of alkanes increases, their boiling points:

Accepted Answer

Increase

Answer

Decrease

Answer

Remain constant

Answer

Fluctuate

Question 2

The complete combustion of alkanes produces:

Accepted Answer

Carbon dioxide and water

Answer

Carbon monoxide and water

Answer

Carbon dioxide and hydrogen

Answer

Carbon monoxide and hydrogen

Question 3

The reaction between an alkane and chlorine gas in the presence of sunlight is an example of:

Accepted Answer

Free radical substitution

Answer

Electrophilic substitution

Answer

Nucleophilic addition

Answer

Radical addition

Question 4

Indicate the reaction used to convert an alkene into an alkane.

Accepted Answer

Hydrogenation

Answer

Halogenation

Answer

Oxidation

Answer

Hydrolysis

Question 5

Provide the name of the following cycloalkane: <Image of a cycloalkane with 8 carbon atoms>

Accepted Answer

Cyclooctane

Answer

Cyclohexane

Answer

Cyclodecane

Answer

Cyclododecane

Question 6

What is the product of the following reaction: CH3CH2CH=CH2 + H2 →

Accepted Answer

CH3CH2CH2CH3

Answer

CH3CH(CH3)CH3

Answer

CH2=CHCH2CH3

Answer

CH3CH2CH=CHCH3

Question 7

Which cycloalkane exhibits the highest stability?

Accepted Answer

Cyclohexane

Answer

Cyclopropane

Answer

Cyclobutane

Answer

Cyclopentane

Question 8

Cyclohexane can adopt different conformations. Which of the following is the most stable conformation of cyclohexane?

Accepted Answer

Chair

Answer

Boat

Answer

Twist-boat

Answer

Half-chair

Question 9

Isomers are compounds with the same molecular formula but different structures. Which of the following compounds is an isomer of pentane?

Accepted Answer

2-methylbutane

Answer

hexene

Answer

cyclopentane

Answer

propene

Question 10

Which of the following accurately describes the general structure of alkanes?

Accepted Answer

Acyclic hydrocarbons with only carbon-carbon single bonds

Answer

Cyclic hydrocarbons with alternating single and double bonds

Answer

Branched hydrocarbons with a mix of single and double bonds

Answer

Hydrocarbons with at least one carbon-carbon triple bond

Question 11

Among the following isomeric alkanes, which one possesses the highest boiling point?

Accepted Answer

Butane

Answer

2-Methylpropane

Answer

Propane

Answer

2,2-Dimethylpropane

Question 12

Which conformation of cyclohexane is the most stable?

Accepted Answer

Chair

Answer

Planar

Answer

Boat

Question 13

Identify the alkane that is NOT a branched alkane:

Accepted Answer

pentane

Answer

2-methylbutane

Answer

2,2-dimethylpropane

Answer

3-methylhexane

Question 14

What is the IUPAC name of the smallest cycloalkane?

Accepted Answer

Cyclopropane

Answer

Cyclobutane

Answer

Cyclopentane

Answer

Cyclohexane

Question 15

Identify the major product of the following reaction: CH₃CH₂CH=CH₂ + H₂

Accepted Answer

CH₃CH₂CH₂CH₃

Answer

CH₃CH₂CH=CH₃

Answer

CH₃CH=CHCH₃

Answer

CH₂=CHCH₂CH₃

Question 16

Which of the following is NOT a property characteristic of alkanes?

Accepted Answer

Highly reactive

Answer

Saturated hydrocarbons

Answer

Composed exclusively of carbon and hydrogen atoms

Answer

Form branched or unbranched chains

Question 17

Identify the structural isomer of butane:

Accepted Answer

2-methylpropane (isobutane)

Answer

Propane

Answer

Pentane

Answer

Ethene (ethylene)

Question 18

Which type of reaction is characteristic of alkanes?

Accepted Answer

Combustion

Answer

Addition

Answer

Substitution

Answer

Elimination

Question 19

Identify the cycloalkane with the molecular formula C5H10:

Accepted Answer

Cyclopentane

Answer

Cyclohexane

Answer

Cycloheptane

Answer

Cyclooctane

Question 20

Which of the following is a structural feature unique to cycloalkanes and not found in alkanes?

Accepted Answer

Saturated ring structure

Answer

Carbon-carbon single bonds

Answer

Branched chains

Answer

Nonpolarity

Question 21

Which of the following is classified as a branched-chain alkane?

Accepted Answer

2-Methylpropane

Answer

Butane

Answer

Propane

Answer

Pentane

Question 22

What type of hybridization do the carbon atoms in cycloalkanes exhibit?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 23

Which cycloalkane experiences the most ring strain?

Accepted Answer

Cyclopropane

Answer

Cyclobutane

Answer

Cyclopentane

Answer

Cyclohexane

Question 24

What is the relationship between an alkane's number of carbon atoms and its boiling point?

Accepted Answer

Positive correlation

Answer

Negative correlation

Answer

No correlation

Answer

Quadratic correlation