Question

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

Answer 1

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:
$s{p}^3<s{p}^2<sp$ Hence, the decreasing order of acidic behaviour is Ethyne > Benzene > Hexane.