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Question 18

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

Answer

Acidic character of a species is defined on the basis of ease with which it can lose its H-atoms.

The hybridization state of carbon in the given compound is:

As the s-character increases, the electronegativity of carbon increases and the electrons of C-H bond pair lie closer to the carbon atom. As a result, partial positive charge of H- atom increases and H+ ions are set free.

The s-character increases in the order:

sp3 < sp2 < sp

Hence, the decreasing order of acidic behaviour is Ethyne > Benzene > Hexane.

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