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CHM 102 Practice Questions Objective Question
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Question

Which is the correct order of decreasing acidity in the following compounds? A. H2O B. CH3CH3 C. NH3 D. CH2=CH2 E. HC≡CH
Options
A A > E > C > D > B
Correct Answer
B A > E > D > B > C
C E > A > C > B > D
D A > C > E > D > B
Correct Answer

Option A is the correct answer.

Detailed Explanation

The correct order of decreasing acidity is: H2O > HC≡CH > NH3 > CH2=CH2 > CH3CH3. Terminal alkynes (pKa ~25) are more acidic than alkenes (pKa ~44) and alkanes (pKa ~50), but less acidic than water (pKa ~15.7) and more acidic than ammonia (pKa ~38).

Hint

How does hybridization affect acidity?

Question Info

Course: CHM 102
Topic: Practice Questions
Type: Objective
Difficulty: Not specified
Question 1156 of 1999
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