Which of the following alkynes is most acidic?

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${CH}_{3} C \equiv CH$

${CH}_{3} {CH}_{2} C \equiv CH$

${CH}_{3} C \equiv {CCH}_{3}$

$CH \equiv CH$

answer is D.

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Detailed Solution

CH₃C≡CCH₃that is But-2-yne has no hydrogen attached to sp hybridized carbon so it is least acidic among the given compounds.
CH₃C≡CH and CH₃CH₂C≡CH that is But-1-yne and Propyne respectively have groups having +I effect attached to triple bond and as the groups having +I effect increases, the acidic character of compound decreases.
Thus CH≡CH that is ethyne is the most acidic of all four compounds.

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