Question 1

Which of the following statements best describes the difference between a molecular formula and a structural formula for alkanes?

Accepted Answer

A molecular formula lists the types and numbers of atoms present, while a structural formula shows the arrangement of atoms and all bonds.

Question 2

What is the general formula for a straight-chain alkane with $$n$$ carbon atoms?

Accepted Answer

$$C_nH_{2n+2}$$

Question 3

A sample of an unknown alkane is found to have the molecular formula $$C_5H_{12}. $$What is the name of this alkane?

Accepted Answer

Pentane

Question 4

Which of the following alkanes would have the highest boiling point?

Accepted Answer

Octane ($$C_8H_{18})$$

Question 5

How many hydrogen atoms are present in an alkane with 9 carbon atoms?

Accepted Answer

24

Question 6

Which of the following is a correct condensed formula for hexane?

Accepted Answer

CH$$_3CH$_2CH$_2CH$_2CH$_2CH$_3$$

Question 7

Which statement about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structures.

Question 8

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

Accepted Answer

2-methylpentane

Question 9

Which alkyl group is formed by removing one hydrogen atom from propane?

Accepted Answer

Propyl

Question 10

A motor lubricant contains an alkane with 11 carbon atoms. What is its molecular formula?

Accepted Answer

$$C_{11}H$$_{24}$$

Question 11

Which of the following is the correct order of boiling points from highest to lowest for the alkanes: $$C_2H_6$$, $$CH_4$$, $$C_3H_8$$, $$C_{14}H$$_{30}$$?

Accepted Answer

3,4,1,2

Question 12

What is the condensed formula for heptane?

Accepted Answer

CH$$_3CH$_2CH$_2CH$_2CH$_2CH$_2CH$_3$$

Question 13

Which of the following is a correct IUPAC name for an alkane with two methyl branches on a pentane chain at positions 2 and 3?

Accepted Answer

2,3-dimethylpentane

Question 14

Which of the following is NOT a property of alkanes?

Accepted Answer

They contain double bonds between carbon atoms.

Question 15

What is the molecular formula for an alkane with 8 carbon atoms?

Accepted Answer

$$C_8H_{18}$$

Question 16

Which of the following is the correct name for $$CH_3CH_2CH_2CH_2CH_3$$?

Accepted Answer

Pentane

Question 17

If an alkane has the molecular formula $$C_4H_{10}$$, how many isomers are possible?

Accepted Answer

2

Question 18

Which of the following is the correct IUPAC name for $$CH_3CH_2CH(CH_3$)CH_2CH_2CH_3$$?

Accepted Answer

3-methylhexane

Question 19

What is the correct line-angle formula representation for pentane?

Accepted Answer

A zig-zag line with five vertices, each representing a carbon atom.

Question 20

Which of the following statements about alkyl groups is correct?

Accepted Answer

An alkyl group is named by replacing the -ane ending of the parent alkane with -yl.

Alkanes: Structure, Nomenclature, and Properties (General Chemistry Study Notes)

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