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Question

Which of the following alkynes is least acidic?

A
CH3CCH
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B
CH3CCCH3
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C
CH3CH2CCH
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D
CHCH
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Solution

The correct option is B CH3CCCH3
But-2-yne has no hydrogen attached to sp hybridised carbon. So all other compounds are more acidic than it and is least acidic.
But -1-yne and Propyne have groups having + I effect (CH3 give + I effect) attached to triple bond. As the number of groups which give +1 effect increases, acidic character decreases.
Acetylene is most acidic among all.
Hence correct option is b.

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