Which of the following alkynes is most acidic?

C H_{3} C \equiv C H

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C H_{3} C \equiv C C H_{3}

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C H_{3} C H_{2} C \equiv C H

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C H \equiv C H

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Solution

The correct option is B $C H \equiv C H$
But-2-yne has no hydrogen attached to $s p$ hybridised carbon. So all other compounds are more acidic than it.
But-1-yne and Propyne have groups having +I effect attached to triple bond. As the number of groups which gives +I effect increases, acidic character decreases. $(C H_{3} \to gives +I effect)$
Thus, ethyne is most acidic of all four compounds.

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Similar questions

C H_{3} C H_{2} C \equiv C H

C H_{3} C \equiv C C H_{3}

C H_{3} C H_{2} C H_{2} C H_{3}

C H_{3} C H = C H_{2}

C h_{3} C = C - C H_{3}

C H_{3} C H_{2} - C H_{2} - C H_{3}

C H_{3} C H_{2} C = C H

C H_{3} C H = C H_{2}

(C H_{3} C O C H_{3})

I .

C H_{2} = C = C H_{2} H_{3} O^{+} - -- \to

I I .

C H_{3} C \equiv C H H_{2} S O_{4} / H g S O_{4} / H_{2} O - ------------ \to

I I I .

C H_{3} C \equiv C H B H_{3} . T H F - ------ \to H_{2} O_{2} / O H^{-}

{CH}_{3} - {CH}_{2} - CH = {CH}_{3}

A g N O_{3}

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