Alkanes and Cycloalkanes: Structure, Properties, and Reactions

Question 1

Which of the following is NOT a characteristic of alkanes?

Accepted Answer

Highly reactive

Answer

Saturated hydrocarbons

Answer

Can be branched or unbranched

Answer

Have low boiling points

Question 2

In the reaction of CH3CH2CH2Br with NaOCH3, what is the expected major product?

Accepted Answer

CH3CH2CH2OCH3

Answer

CH3CH=CH2

Answer

CH3CH2CH2OH

Answer

CH3CH2CH2Br

Question 3

Which of the following compounds is an alkane?

Accepted Answer

CH3CH2CH2CH2CH3

Answer

CH3CH2OH

Answer

CH3COOH

Answer

C6H6

Question 4

Which alkane among the following exhibits the lowest boiling point?

Accepted Answer

Butane

Answer

Pentane

Answer

Hexane

Answer

Heptane

Question 5

Which consequence arises from the chair conformation of cyclohexane?

Accepted Answer

Axial and equatorial hydrogen atoms

Answer

Equivalent bond angles between all carbon atoms

Answer

Planar ring structure

Answer

High ring strain

Question 6

Which of these compounds has the highest normal boiling point?

Accepted Answer

Cyclohexane

Answer

Propane

Answer

2,2-Dimethylpropane

Answer

2-Methylbutane

Question 7

Which of the following compounds has the highest boiling point?

Accepted Answer

Hexane

Answer

Propane

Answer

Butane

Answer

Pentane

Question 8

Cycloalkanes are characterized by which type of reaction?

Accepted Answer

Addition

Answer

Substitution

Answer

Elimination

Answer

Polymerization

Question 9

Which of the following is a true statement about alkanes?

Accepted Answer

Alkanes are saturated hydrocarbons.

Answer

Alkanes are highly reactive.

Answer

Alkanes have a high density.

Answer

Alkanes are soluble in water.

Question 10

Which of the following is a branched alkane?

Accepted Answer

2-Methylpropane

Answer

Ethane

Answer

Propane

Answer

Butane

Question 11

What type of hybridization is present in the carbon atoms of alkanes?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 12

Which of the following reagents can be used to distinguish between alkanes and alkenes?

Accepted Answer

Bromine water

Answer

Potassium permanganate

Answer

Sodium hydroxide

Answer

Hydrochloric acid

Question 13

What is the product of the following combustion reaction: $C_6H_{14} + 11O_2 longrightarrow$?

Accepted Answer

6CO2 + 7H2O

Answer

7CO2 + 8H2O

Answer

6CO + 7H2O

Answer

7CO + 8H2O

Question 14

Determine the IUPAC name of the compound with the molecular formula CH3CH(CH3)CH2CH2CH3.

Accepted Answer

2-Methylpentane

Answer

3-Methylpentane

Answer

2-Ethylbutane

Answer

3-Ethylbutane

Question 15

Which physical property is characteristic of alkanes?

Accepted Answer

Low boiling points

Answer

High reactivity

Answer

Solubility in water

Answer

Polarity

Question 16

Which cycloalkane exhibits the highest stability?

Accepted Answer

Cyclohexane

Answer

Cyclopropane

Answer

Cyclobutane

Answer

Cyclopentane

Question 17

Which conformer of cyclohexane is the most stable?

Accepted Answer

Chair conformation

Answer

Boat conformation

Answer

Twist-boat conformation

Answer

Half-chair conformation

Question 18

Which of the following cycloalkanes is the least stable due to ring strain?

Accepted Answer

Cyclobutane

Answer

Cyclohexane

Answer

Cyclooctane

Answer

Cyclodecane

Question 19

What hybridization state do the carbon atoms in cyclohexane adopt?

Accepted Answer

sp^3

Answer

sp

Answer

sp^2

Answer

sp^3d

Question 20

Describe the relationship between the number of carbon atoms and hydrogen atoms in a cycloalkane:

Accepted Answer

The number of hydrogen atoms is always one less than twice the number of carbon atoms.

Answer

The number of hydrogen atoms is always twice the number of carbon atoms.

Answer

The number of hydrogen atoms is always one more than twice the number of carbon atoms.

Answer

The number of hydrogen atoms is not related to the number of carbon atoms.

Question 21

Which of the following is the correct IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?

Accepted Answer

2-methylbutane

Answer

2-methylpentane

Answer

3-methylbutane

Answer

2-methyl-3-butane

Question 22

What is the hybridization of the carbon atoms in cyclohexane?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d

Question 23

Which of the following is the most stable conformation of cyclohexane?

Accepted Answer

Chair

Answer

Boat

Answer

Twist

Answer

Plane

Question 24

Which of the following is the product of the reaction of propene with hydrogen?

Accepted Answer

Propane

Answer

Propylene

Answer

2-propanol

Answer

1-propanol

Question 25

Among the following, which is not an isomer of butane?

Accepted Answer

Pentane

Answer

2-Methylpropane

Answer

Isobutane

Answer

2,2-Dimethylpropane

Question 26

What is the product formed in the following reaction: CH3-CH2-CH2-Br + KOH ---> ?

Accepted Answer

CH3-CH2-CH2-OH

Answer

CH3-CH=CH2

Answer

CH3-CH2-CH2-K

Answer

No reaction occurs.

Question 27

What is the major product of the following reaction: CH3-CH=CH2 + H2 -> ?

Accepted Answer

CH3-CH2-CH3

Answer

CH3-CH=CH2

Answer

CH3-CH2-CH2-OH

Answer

No reaction occurs.

Question 28

What is the hybridization of the carbon atom involved in a C-H bond in methane?

Accepted Answer

sp3

Answer

sp

Answer

sp2

Answer

sp3d