Question 1

Which of the following is the correct general formula for a straight-chain alkane?

Accepted Answer

$$C_nH_{2n+2}$$

Question 2

A hydrocarbon molecule contains 14 hydrogen atoms. According to the alkane general formula, how many carbon atoms does it have?

Accepted Answer

6

Question 3

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

Accepted Answer

2-methylpropane

Question 4

What is the IUPAC name for the following structure?

$$CH_3$$-$$CH_2-CH$$($$CH_3$$)-$$CH_3$$

Accepted Answer

2-methylbutane

Question 5

Which of the following statements about alkanes is TRUE?

Accepted Answer

They contain only single bonds between carbon atoms.

Question 6

Given the structure $$CH_3$$-$$CH_2$$-$$CH_2$$-$$CH_3$$, what is the correct IUPAC name?

Accepted Answer

Butane

Question 7

Which of the following is the correct name for the alkyl group $$-CH_2CH_3$$?

Accepted Answer

Ethyl

Question 8

A compound has the molecular formula $$C_5H_{12}. $$Which of the following is a possible name for this compound?

Accepted Answer

Pentane

Question 9

Which of the following steps is NOT part of the IUPAC naming process for alkanes?

Accepted Answer

Always start numbering from the end with the most hydrogens.

Question 10

Which of the following best describes a constitutional (structural) isomer?

Accepted Answer

Compounds with the same molecular formula but different connectivity of atoms.

Question 11

A patient is exposed to a hydrocarbon with the formula $$C_7H_{16}. $$Which of the following is the correct name for this compound?

Accepted Answer

Heptane

Question 12

Which of the following is the correct IUPAC name for the structure shown below?

$$CH_3$$-$$CH_2$$-$$CH_2-CH$$($$CH_3$$)-$$CH_2$$-$$CH_3$$

Accepted Answer

3-methylhexane

Question 13

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

Accepted Answer

They are saturated hydrocarbons and burn cleanly in oxygen.

Question 14

A molecule is named 4-ethyl-2-methylhexane. Which of the following statements is TRUE about its structure?

Accepted Answer

It has a six-carbon chain with an ethyl group on carbon 4 and a methyl group on carbon 2.

Question 15

Which of the following is the correct IUPAC name for the structure shown below?

$$CH_3-CH$$($$CH_3$$)-$$CH_2$$-$$CH_3$$

Accepted Answer

2-methylbutane

Question 16

Which of the following best describes an alkyl group?

Accepted Answer

An alkane with one hydrogen atom removed, named by replacing -ane with -yl.

Question 17

A student is asked to name the following structure: $$CH_3$$-$$CH_2$$-$$CH_2$$-$$CH_2$$-$$CH_3. $$What is the correct IUPAC name?

Accepted Answer

Pentane

Question 18

Which of the following is the correct name for the alkyl group $$-CH_2CH_2CH_3$$?

Accepted Answer

Propyl

Question 19

A hydrocarbon is found to have the formula $$C_8H_{18}. $$Which of the following is the correct name for this compound?

Accepted Answer

Octane

Question 20

Which of the following is a correct step in naming a branched alkane according to IUPAC rules?

Accepted Answer

Number the carbon chain from the end nearest a substituent.

Introduction to Organic Chemistry: Alkanes and Their Nomenclature

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