Question 1

Which of the following is the correct general formula for an unbranched alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 2

Which of the following statements about constitutional isomers is correct?

Accepted Answer

They have the same molecular formula but different connectivity of atoms.

Question 3

What is the IUPAC name for the following compound?

$$CH_3CH_2CH(CH_3$)CH_2CH_3$$

Accepted Answer

3-methylpentane

Question 4

Which of the following is NOT a correct step in the IUPAC naming of alkanes?

Accepted Answer

Always number the chain from the end with the highest molecular weight substituent.

Question 5

Which of the following is the correct IUPAC name for the compound with the structure:

$$CH_3CH_2CH_2CH(CH_3$)CH_2CH_3$$

Accepted Answer

3-methylhexane

Question 6

A hydrocarbon with the formula $$C_5H_{12}$$ could be which of the following?

Accepted Answer

All of the above

Question 7

Which of the following best describes a homologous series?

Accepted Answer

A group of compounds that differ only by the number of methylene ($$CH_2) $$groups.

Question 8

Given the structure below, what is the correct IUPAC name?

$$CH_3CH_2CH(CH_3$)CH_2CH_2CH_3$$

Accepted Answer

4-methylhexane

Question 9

Which of the following is the correct name for a compound with three methyl groups at positions 2, 5, and 7 on a decane chain?

Accepted Answer

2,5,7-trimethyldecane

Question 10

Which of the following is a correct example of an 'iso' group?

Accepted Answer

$$CH_3CH(CH_3$)CH_2$- ($$isobutyl group)

Question 11

A student is asked to name the following compound:

$$CH_3CH_2CH_2CH_2CH_2CH_3$$

What is the correct IUPAC name?

Accepted Answer

hexane

Question 12

Which of the following statements about alkyl groups is correct?

Accepted Answer

An alkyl group is formed by removing a hydrogen atom from an alkane.

Question 13

Which of the following is the correct structure for 4-isopropyloctane?

Accepted Answer

An eight-carbon chain with an isopropyl group on carbon 4.

Question 14

If a compound has the structure $$CH_3CH_2CH_2CH_2CH_2CH_2CH_3$$, what is its molecular formula?

Accepted Answer

$$C_7H_{16}$$

Question 15

Which of the following is the correct IUPAC name for a compound with a methyl group on carbon 2 and an ethyl group on carbon 4 of a hexane chain?

Accepted Answer

4-ethyl-2-methylhexane

Question 16

A compound is named 3-ethyl-2,4,5-trimethylheptane. How many carbon atoms are in the main chain?

Accepted Answer

7

Question 17

Which of the following is a correct application of the IUPAC rule for numbering the main chain?

Accepted Answer

Number the chain so that the substituents have the lowest possible set of numbers.

Question 18

Which of the following is the correct IUPAC name for the compound below?

$$CH_3CH_2CH(CH_3$)CH_2CH_2CH_2CH_3$$

Accepted Answer

4-methylheptane

Question 19

Which of the following best describes the relationship between n-butane and isobutane?

Accepted Answer

They are constitutional isomers.

Question 20

A student is asked to name a compound with the following structure:

$$CH_3CH_2CH_2CH_2CH_2CH_2CH_2CH_3$$

What is the correct IUPAC name?

Accepted Answer

octane

Structure and Stereochemistry of Alkanes: Nomenclature and Properties

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