Which of the following statements are correct about $S F_{4}$ ?

It is prepared by treating $S C l_{2}$ with a fluoride like $N a F$ in acetonitrile.

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Its initial hydrolysis gives $S O_{2}$ and $H F$ .

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It has a square planar shape with the sulphur atom having 2 lone pairs.

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$S$ atom has an expanded octet.

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Solution

The correct option is D
$S$ atom has an expanded octet.

\SF_4\) is prepared by treating $S C l_{2}$ with a fluoride in acetonitrile:

$3 S C l_{2} + 4 N a F ⟶ S F_{4} + S_{2} C l_{2} + 4 N a C l$

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

$S F_{4} + 2 H_{2} O ⟶ S O_{2} + 4 H F$

This reaction explains why $S F_{4}$ is toxic as it reacts with the moisture in the lungs. Both the products are acidic.

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