Question

Predict the basicity of final product (having sulphur) obtained when $S{F}_4$ undergoes hydrolysis.

Answer 1

The balanced chemical equation for the hydration of $S{F}_4$ is shown below.
$S{F}_4+3H_{2}O\to H_{2}S{O}_3+4HF$.
Sulphurous acid $H_{2}S{O}_3$ is dibasic acid as both H atoms can be dissociated.
Thus, the basicity of final product (having sulphur) obtained when $S{F}_4$ undergoes hydrolysis is 2.