Doubt & Answer Explanation

Answer Explanation

You are right in saying that ethyne is more acidic than ethane and ethene.

Ethyne contains sp hybridized carbons, while ethene and ethane contain sp2 and sp3 hybridized carbons respectively. The sp hybrid orbitals have greater s character than sp2 and sp3, which allows negative charge to be held closer to the nucleus upon protonation, lowering the overall energy, and increasing the acidic character. The same argument can be made between sp2 and sp3, giving alkenes more acidity.

Note that in a practical sense, all three of these species are not acidic. Their acidic character is very very weak.

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