5) How many degrees of unsaturation are introduced by a triple bond?
A) 0
B) 1
C) 2
D) 3
Answer: C
Difficulty: 1 Easy
Section: 11.01
Topic: Alkynes
Bloom’s: 5. Evaluate
Chapter: 11
Accessibility: Keyboard Navigation
6) How many s bonds and p bonds are present in a triple bond?
A) One s bond and one p bond.
B) One s bond and two p bonds.
C) Two s bonds and one p bond.
D) Two s bonds and two p bonds.
Answer: B
Difficulty: 1 Easy
Section: 11.01
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
Accessibility: Keyboard Navigation
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 p bonds of a C-C triple bond are weaker than a C-C s bond.
D) The electrons in the p bonds of alkynes are more tightly held than those of alkenes.
Answer: D
Difficulty: 1 Easy
Section: 11.01
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
Accessibility: Keyboard Navigation
15) Which of the following about the physical properties of alkynes is not true?
A) Alkynes have low melting and boiling points.
B) Melting and boiling points increase as the number of carbons increases.
C) Alkynes are soluble in organic solvents.
D) Alkynes are soluble in water.
Answer: D
Difficulty: 1 Easy
Section: 11.03
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
Accessibility: Keyboard Navigation
16) Which of the following explains why 1-pentyne has a slightly higher boiling point than 1-pentene?
A) 1-Pentyne has more carbons than 1-pentene.
B) 1-Pentyne has more carbons per hydrogen than 1-pentene.
C) 1-Pentyne is linear while 1-pentene is trigonal planar.
D) The C-C triple bond in 1-pentyne is more polar than the C-C double bond in 1-pentene.
Answer: D
Difficulty: 1 Easy
Section: 11.03
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
Accessibility: Keyboard Navigation
21) Which of the following statements about the reactions of alkynes is not true?
A) Alkynes contain easily broken p bonds.
B) Alkynes undergo addition reactions.
C) When alkynes undergo two sequential addition reactions, four new s bonds are formed.
D) When alkynes undergo two sequential addition reactions, two new s bonds and a p bond are formed.
Answer: D
Difficulty: 1 Easy
Section: 11.06
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
Accessibility: Keyboard Navigation
26) Which of the following bases can deprotonate acetylene? You are given the pKa values of the conjugate acids in parentheses.
A) Only I and II
B) Only I and III
C) Only II and III
D) Only II and IV
Answer: B
Difficulty: 1 Easy
Section: 11.06
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
27) Which of the following bases cannot deprotonate acetylene? You are given the pKa values of the conjugate acids in parentheses.
A) Only I and II
B) Only I and III
C) Only II and III
D) Only II and IV
Answer: D
Difficulty: 1 Easy
Section: 11.06
Topic: Alkynes
Bloom’s: 3. Apply
Chapter: 11
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