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Q.

The correct order of pKa values among the following is?

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a

Ethene < Ethyne < Ethane

b

Ethyne < Ethene < Ethane

c

Ethane < Ethene < Ethyne

d

Ethane < Ethyne < Ethene

answer is B.

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Detailed Solution

The sp hybridized Alkynes are most acidic than its counterparts i.e. sp3 hybridized alkanes and sp2 hybridized alkenes. So the pKa values of Alkynes are less than alkenes and alkanes.

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