Question Detail

CHM 102 Alkynes: Structure, Bonding, and Nomenclature Objective Question
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Question

What is the pKa range of a terminal alkyne (e.g., ethyne)?
Options
A ~50
B ~25
Correct Answer
C ~16
D ~4
Correct Answer

Option B is the correct answer.

Detailed Explanation

Terminal alkynes have pKa ≈ 25, which is much more acidic than alkanes (pKa ~50) and alkenes (pKa ~44) but less acidic than water (pKa 15.7) or alcohols.

Hint

Acidic enough to be deprotonated by strong bases like NaNH2.

Question Info

Course: CHM 102
Topic: Alkynes: Structure, Bonding, and Nomenclature
Type: Objective
Difficulty: Not specified
Question 195 of 1999
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