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Question

Which of the following alkynes is most 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 D CHCH
Compound (b), But 2-yne has no hydrogen attached to sp hybridised carbon. Thus it lacks acidic hydrogen, so all other compounds are more acidic than it.
In compound (c) and (a) i.e., But-1-yne and Propyne has methyl groups which shows + I effect attached to triple bond. As the number of groups which gives + I effect increases, acidic character decreases. (CH3 gives +I effect)
Thus, ethyne does not have any +I group and it has two sp hydridised hydrogen atom which make it most acidic of all four compounds.

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