Question 1

Which of the following statements best describes the structure of alkanes?

Accepted Answer

Alkanes contain only carbon-carbon single bonds and hydrogen atoms.

Question 2

What is the correct IUPAC name for a straight-chain alkane with 7 carbon atoms?

Accepted Answer

Heptane

Question 3

A hydrocarbon ring with 5 carbon atoms and only single bonds is called:

Accepted Answer

Cyclopentane

Question 4

What is the condensed formula for ethane?

Accepted Answer

$$\mathrm{C_2H_6}$$

Question 5

Which prefix is used for an alkane with 9 carbon atoms?

Accepted Answer

Non-

Question 6

How many hydrogen atoms are present in hexane ($$\mathrm{C_6H_{?}}$$)?

Accepted Answer

$$\mathrm{C_6H_{14}}$$

Question 7

What is the correct name for a molecule with a three-carbon chain and a methyl group attached to the second carbon?

Accepted Answer

2-methylpropane

Question 8

When drawing a line-angle structure for octane, how many vertices (corners) should be present?

Accepted Answer

8

Question 9

Which of the following is the correct formula for cyclobutane?

Accepted Answer

$$\mathrm{C_4H_8}$$

Question 10

A molecule is named 3-ethylpentane. Which of the following best describes its structure?

Accepted Answer

A five-carbon chain with an ethyl group attached to the third carbon.

Question 11

What is the general formula for a straight-chain alkane?

Accepted Answer

$$\mathrm{C_nH_{2n+2}}$$

Question 12

If you start drawing a line-angle structure for nonane (9 carbons) starting 'down', what direction should you finish?

Accepted Answer

Down

Question 13

Which of the following is NOT a correct name for an alkane?

Accepted Answer

Methene

Question 14

What happens to the number of hydrogen atoms when a straight-chain alkane forms a cycloalkane ring?

Accepted Answer

Two hydrogen atoms are lost.

Question 15

Which of the following is the correct IUPAC name for a ring structure with 8 carbon atoms and only single bonds?

Accepted Answer

Cyclooctane

Question 16

What is the correct name for a molecule with a four-carbon ring?

Accepted Answer

Cyclobutane

Question 17

Which of the following is the correct condensed formula for propane?

Accepted Answer

$$\mathrm{C_3H_8}$$

Question 18

A molecule has the formula $$\mathrm{C_5H_{12}}. $$What is its name?

Accepted Answer

Pentane

Question 19

Which of the following is the correct name for a substituent with two carbon atoms?

Accepted Answer

Ethyl

Question 20

If a molecule is named 2-methylpentane, what does the '2' indicate?

Accepted Answer

The methyl group is attached to the second carbon of the pentane chain.

Alkanes: Structure, Nomenclature, and Cycloalkanes

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