Organic Chemistry 4th Edition By Janice Smith – Test Bank

Chapter 11: Alkynes

1. Which of the following molecular formulas is consistent with the formula for a molecule containing one alkyne and no other degrees of unsaturation?

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

2. Which of the following represents a terminal alkyne?

A) Only I and II B) Only II and III C) Only I and III D) Only II and IV

3. Which of the following represents an internal alkyne?

A) Only I and II B) Only I and III C) Only II and IV D) Only II and III

4. Which of the following alkynes is a symmetrical alkyne?

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

5. How many degrees of unsaturation are introduced by a triple bond?
A) 0 B) 1 C) 2 D) 3

6. How many  bonds and  bonds are present in a triple bond?
A) One  bond and one  bond. C) Two  bonds and one  bond.
B) One  bond and two  bonds. D) Two  bonds and two  bonds.

7. Which of the following statements about alkynes is not true?
A) Alkynes undergo many addition reactions.
B) Alkynes are more polarizable than alkenes.
C) Both  bonds of a C-C triple bond are weaker than a C-C  bond.
D) The electrons in the  bonds of alkynes are more tightly held than those of alkenes.

8. Give the IUPAC name for the following compound.

A) 6,6-Dimethyl-3-octyne C) 3,3-Dimethy-5-octyne
B) 3,3-Dimethyl-3-octyne D) 6-Ethyl-6-methyl-3-heptyne

9. Give the IUPAC name for the following compound.

A) 4,4-Diethyl-1-octyne C) 4,4-Dipropyl-6-heptyne
B) 4,4-Dipropyl-1-heptyne D) 4,4-Diethyl-6-octyne

10. Give the IUPAC name for the following compound.

A) 4-Chloro-4-methyl-2-heptyne C) 3-Chloro-3-methyl-4-hexyne
B) 3-Chloro-3-methyl-4-heptyne D) 4-Chloro-4-methyl-2-hexyne

Answer Key

1. C
2. D
3. B
4. C
5. C
6. B
7. D
8. A
9. B
10. D