Question

Which among the following compounds does not undergo hydrolysis?

• A. ${\mathrm{TeF}}_6$
• B. ${\mathrm{SF}}_6$
• C. ${\mathrm{NCl}}_3$
• D. ${\mathrm{NF}}_3$

Answer 1

The correct option is D

${\mathrm{NF}}_3$

Explanation for correct option

(D)${\mathrm{NF}}_3$

• ${\mathrm{NF}}_3$ is not hydrolyzed because in ${\mathrm{NF}}_3$ both $\mathrm{N}$ and $\mathrm{F}$ have no vacant orbital to accommodate electrons.
• So, ${\mathrm{NF}}_3$ does not get hydrolyzed.

Explanation for incorrect option

(A)

• ${\mathrm{TeF}}_6$ is hydrolysed to form ${\mathrm{H}}_6{\mathrm{TeO}}_6$

${\mathrm{TeF}}_6+6{\mathrm{H}}_2\mathrm{O}\to 6\mathrm{HF}+{\mathrm{H}}_6{\mathrm{TeO}}_6$

(B)

• ${\mathrm{SF}}_6$ atom is sterically protected by six $\mathrm{F}$ atoms and does not allow water molecules to attack the $\mathrm{S}$ atom. Further, $\mathrm{F}$ does not have d-orbitals to accept. Hence${\mathrm{SF}}_6$ is not hydrolyzed.

(C)

• ${\mathrm{NCl}}_3$ is hydrolyzed to form ammonia and $\mathrm{HOCl}$

Hence, options (A), (B), and (C) are incorrect.

Hence, option (D) is correct. ${\mathrm{NF}}_3$ does not undergo hydrolysis.