Q. 184.9( 8 Votes )

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

Answer :

The acidic character of a species is defined as the ease with which it can lose its H- atoms.

The hybridization state of carbon in the given compounds is as shown below:-

Now, as the s–character increases, the electronegativity of carbon increases and the electrons of C–H bond pair lies closer to the carbon atom. As a result, the 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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