Which of the following halides cannot be hydrolysed at room temperature?
(I) `TeF_(6)`
(II) `SF_(6)`
(III) `NCl_(3)`
(IV) `NF_(3)`
Choose the correct code:

Options

A. III and IV
B. I, II and III
C. I, II and IV
D. II and IV

Answer

D

Explanation

In `SF_(6)`, S sterically hindered by six fluorine atoms hence, attack of `H_(2)O` molecule will not occur, `NF_(3)` is not hydrolysed due to absence of vacant orbital either on N of F atom.
`TeF_(6)` is hydrolysed due to large size of Te.