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# Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour.

13.18     Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour.

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As the $s$ character increases, the electronegativity of the carbon atom also increases. As a result, there is a development of partial charges in the C-H bond.
increasing order of $s$ character-

$sp^3

More is the $s$ character, more is the acidic nature of the compound.
So, the decreasing order of acidic behaviour is-
ethyne(50% $s$) >benzene(33% $s$) > hexane(25% $s$)

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