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

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Since s-electrons are close to the nucleus, therefore as the s-character of the orbital making the C-H bond increases, the electrons of C-H bond lie closer and closer to the carbon atom. In other words, the partial positive charge on the H-atom and hence the acidic character increases as the s character of the orbital increases. 

Thus the acidic character decreases in the order: 

Ethyne> Benzene> Hexane

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