Arrange ethyne,ethane and ethene in the order of increasing acidity .

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Solution

With increase in s character acidity increases.
Ethyne (H-C≡C-H): here carbon is sp hybridised : % s character = 50 %
Ethene (H₂C=CH₂): here carbon is sp² hybridised : % s character = 33.3 %
Ethane (H₃C-CH₃): here carbon is sp³ hybridised : % s character = 25 %

As order % s character is ethane< ethene < ethyne, so the order of acidity is ethane< ethene < ethyne.

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