Question 1

Which of the following is the correct general molecular formula for a straight-chain alkane with no rings?

Accepted Answer

$$C_nH_{2n+2}$$

Question 2

Which statement best explains why the boiling point of alkanes increases as the number of carbons increases?

Accepted Answer

Larger alkanes have increased van der Waals (dispersion) forces due to greater surface area.

Question 3

Which of the following is a constitutional isomer of butane ($$C_4H_{10}$$)?

Accepted Answer

Isobutane ($$CH_3CH(CH_3$)_2)$$

Question 4

Which type of carbon is present in neopentane but not in n-pentane?

Accepted Answer

Quaternary carbon

Question 5

What is the IUPAC name for the following structure: $$CH_3CH_2CH(CH_3$)CH_2CH_3$$?

Accepted Answer

2-Methylpentane

Question 6

Which of the following statements about alkanes is FALSE?

Accepted Answer

Alkanes are generally soluble in water.

Question 7

Which of the following is the correct IUPAC name for the compound with the structure $$CH_3CH_2CH_2CH_2CH_3$$?

Accepted Answer

Pentane

Question 8

Which of the following is NOT a straight-chain alkane?

Accepted Answer

Isobutane

Question 9

How many secondary carbons are present in the structure of n-butane ($$CH_3CH_2CH_2CH_3$$)?

Accepted Answer

2

Question 10

Which of the following best describes the difference between straight-chain and branched-chain alkanes?

Accepted Answer

Branched-chain alkanes have at least one carbon connected to three or four other carbons.

Question 11

Which of the following is the correct IUPAC name for the compound $$CH_3CH(CH_3$)CH_2CH_3$$?

Accepted Answer

2-Methylbutane

Question 12

Which of the following is a property of alkanes that makes them useful as fuels?

Accepted Answer

They undergo combustion to produce $$CO_2$$, $$H_2O$$, and heat.

Question 13

Which of the following is the correct molecular formula for decane?

Accepted Answer

$$C_{10}H$$_{22}$$

Question 14

Which of the following is a correct statement about the physical properties of constitutional isomers?

Accepted Answer

Constitutional isomers have different physical properties such as boiling point and melting point.

Question 15

Which of the following is the correct IUPAC name for the structure $$CH_3CH_2CH_2CH_2CH_2CH_3$$?

Accepted Answer

Heptane

Question 16

Which of the following statements about the solubility of alkanes is correct?

Accepted Answer

Alkanes are soluble in non-polar solvents.

Question 17

Which of the following is the correct IUPAC name for the structure $$CH_3CH_2CH_2CH_2CH_2CH_2CH_3$$?

Accepted Answer

Heptane

Question 18

Which of the following is a branched-chain alkane?

Accepted Answer

Neopentane

Question 19

Which of the following is the correct IUPAC name for the structure $$CH_3CH_2CH_2CH_2CH_2CH_2CH_2CH_3$$?

Accepted Answer

Octane

Question 20

Which of the following is the correct IUPAC name for the structure $$CH_3CH_2CH_2CH_2CH_2CH_2CH_2CH_2CH_3$$?

Accepted Answer

Nonane

2. Alkanes and Their Stereochemistry: Structure and Properties

Study Guide - Practice Questions