Why thionyl chloride behaves as Lewis acid as well as Lewis base?.

Hybridization of sulphur in SOCI₂ is sp3 having three bond pair and one lone pair.

Lewis base character is due to the presence of a lone pair of electrons. In SOCl₂, the central atom sulphur atom has vacant d orbitals. Hence it can accept electron pairs. Therefore it can behave as a Lewis acid.

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