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CHM 102 Practice Questions Objective Question
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Question

Which of the following statements is not true about propyne, HC–C≡CH3?
Options
A It contains six sigma bonds.
B It contains three pi bonds.
Correct Answer
C The H–C–H bond angle is about 109.5°.
D The C–C–C bond angle is 180°.
Correct Answer

Option B is the correct answer.

Detailed Explanation

Propyne (HC≡C-CH3) contains only two pi bonds (from the triple bond). It has six sigma bonds (3 C-H bonds in CH3, 1 C-C bond, 1 C-H bond, and 1 C-C sigma bond from the triple bond). The methyl group has tetrahedral geometry (109.5°) and the alkyne carbons are linear (180°).

Hint

How many pi bonds are in a triple bond?

Question Info

Course: CHM 102
Topic: Practice Questions
Type: Objective
Difficulty: Not specified
Question 1153 of 1999
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