Organic Chemistry 9Th ed by Francis Carey - Test Bank

Chapter 2: Hydrocarbon Frameworks - Alkanes

1. Alkanes are characterized by the general molecular formula:

A) CnH2n-2 B) CnH2n C) CnH2n+2 D) CnH2n+4

Ans: C

2. Cycloalkanes are characterized by the general molecular formula:

A) CnH2n-2 B) CnH2n C) CnH2n+2 D) CnH2n+4

Ans: B

3. The carbon-carbon sigma bond in ethane is formed by overlap of which two orbitals?

A) 2p-2p B) sp-sp C) sp2

-sp

2 D) sp3-sp3

Ans: D

4. What is the IUPAC name of the following compound?

A) 4,4-dimethylpentane C) 2,2-dimethylpentane

B) 1-tert-butylpropane D) 1,1,1-trimethylbutane

Ans: C

5. The correct IUPAC name of the following compound is

A) 2-ethyl-3,5-dimethylheptane. C) 3,4,4-trimethyloctane.

B) 6-ethyl-5,5-dimethylheptane. D) 5,5,6-trimethyloctane.

Ans: C

6. The common name of the following group is

A) n-butyl. B) sec-butyl. C) isobutyl. D) tert-butyl.

Ans: B

Page 16Chapter 2 Hydrocarbon Frameworks - Alkanes

7. Which one of the following is 2,2,5-trimethylhexane?

A) (CH3)2CHCH2C(CH3)3 C) CH3CH2CH(CH3)C(CH3)3

B) (CH3)2CHCH2CH2C(CH3)3 D) (CH3)2CHCH2 CH2CH2C(CH3)3

Ans: B

8. The correct IUPAC name of the following is

A) 2,4,7-trimethylnonane. C) 7-ethyl-2,4-dimethyloctane.

B) 3,6,8-trimethylnonane. D) 2-ethyl-5,7-dimethyloctane.

Ans: A

9. What is the IUPAC name of the following?

A) 5,6-diethylhexane C) 5-ethyl-6-methylheptane

B) 2,3-diethylhexane D) 4-ethyl-3-methylheptane

Ans: D

10. What is the IUPAC name of the following?

A) 1-ethyl-4.4-dimethylcyclopentane C) 3-ethyl-1,1-dimethylcyclopentane

B) 1-ethyl-3,3-dimethylcyclopentane D) 4-ethyl-1,1-dimethylcyclopentane

Ans: C

11. Cyclohexane is composed of

A) methine groups. B) methylene groups. Ans: B

C) methyl groups.

D) both methine and methylene groups.

Page 17Chapter 2 Hydrocarbon Frameworks - Alkanes

12. All the carbons in cyclopentane are

A) primary carbons. B) secondary carbons. Ans: B

13. The correct name of the following compound is

C) tertiary carbons.

D) quaternary carbons.

A) (1-methylpropyl)cyclohexane. C) (2,2-dimethylethyl)cyclohexane.

B) (2-methylpropyl)cyclohexane. D) (2,2-dimethylpropyl)cyclohexane.

Ans: B

14. The correct IUPAC name of the following compound is

A) (1-methylhexyl)cyclopentane. C) 2-cyclopentylheptane.

B) (1-pentylethyl)cyclopentane. D) 1-cyclopentyl-2-heptane.

Ans: C

15. The C—C sigma bond in acetylene is formed by the overlap of which two orbitals?

A) 2p-2p B) sp-sp C) sp2

-sp

2 D) sp3-sp3

Ans: B

°

16. The boiling point of isobutane (-10.2

C) is lower than n-butane (-0.4°

C) because

isobutane has

A) weaker intermolecular van der Waals forces.

B) stronger intermolecular van der Waals forces.

C) weaker dipole-dipole attractive forces.

D) stronger dipole-dipole attractive forces.

Ans: A

Page 18Chapter 2 Hydrocarbon Frameworks - Alkanes

17. Which of the following are constitutional isomers?

A) I, II, and III B) I, III, and IV Ans: A

C) only I and III

D) all are constitutional isomers

18. Arrange the following isomeric alkanes in order of increasing boiling point.

I. n-heptane

II. 2,3-dimethylpentane

III. 2,2,3-trimethylbutane

A) I < II < III B) II < III < I C) III < I < II D) III < II < I

Ans: D

19. The oxidation states of carbon range from

A) 0 to +2. B) 0 to +4. C) –4 to 0. D) –4 to +4.

Ans: D

20. Which of the following has(have) a higher oxidation state of carbon than the carbon in

formaldehyde, H2C=O?

I. CH3OH

II. HCO2H

III. H2CO3

A) I B) III C) II and III D) I, II, and III

Ans: C

21. The tert-butyl group can also be called

A) 1,1-dimethylpropyl. C) 2,2-dimethylpropyl.

B) 1,1-dimethylethyl. D) 2,2-dimethylethyl.

Ans: B

Page 19Chapter 2 Hydrocarbon Frameworks - Alkanes

22. Carbon atoms 1, 2, and 3 in the following structure are classified, respectively, as

A) tertiary, primary, secondary. C) quaternary, secondary, secondary.

B) quaternary, primary, tertiary. D) quaternary, secondary, tertiary.

Ans: D

23. Identify the isomer of C6H14 that only has primary and tertiary carbons.

A) hexane B) 2,2-dimethylbutane C) 3-methylpentane D)

2,3-dimethylbutane

Ans: D

24. Why can heats of combustion of constitu