Question

Which of the following statements are correct about $S{F}_4$?

• A. It is prepared by treating $SC{l}_2$ with a fluoride like $NaF$ in acetonitrile.
• B. Its initial hydrolysis gives $S{O}_2$ and $HF$.
• C. It has a square planar shape with the sulphur atom having 2 lone pairs
• D. $S$ atom has an expanded octet.

Answer 1

Answer: (A), (B), (D)

$S$ atom has an expanded octet.

\SF_4\) is prepared by treating $SC{l}_2$ with a fluoride in acetonitrile:

$3SC{l}_2+4NaF⟶S{F}_4+S_{2}C{l}_2+4NaCl$

Alternatively, it cood be synthesized in sizable yields by combining an ionic fluoride like $NaF$ with elemental sulphur and chlorine. On hydrolysis:

$S{F}_4+2H_{2}O⟶S{O}_2+4HF$

This reaction explains why $S{F}_4$ is toxic as it reacts with the moisture in the lungs. Both the products are acidic.