First slide

Lewis theory

Question

Which one of following acts as Lewis acid but not as a Lewis base

Moderate

A

$CO$
B

${SCl}_{4}$
C

${SO}_{2}$
D

${PF}_{5}$

Solution

1) $C_{. .}^{-} \equiv O_{. .}^{+}$ is a strong ligand, a Lewis base but not a Lewis acid;
2) $\ddot{S} O_{2}, \ddot{S} {Cl}_{4} . . .$ contain lone pair on cental atom thus act like Lewis base ;
They can expand valency thus act like Lewis acid ;
3) ${PF}_{5} . . .$ can expand valency thus Lewis acid;
No lone pair on central atom thus cannot act like Lewis base ;

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