Which of the folowing have undistorted octahedral structures:(1) `SF_(6) (2) PF_(6)^(-) (3) SIF_(6)^(2-) (4) XeF_(6)`
Select the correct answer using the codes given below

Options

A. 2,3 and 4
B. 1,3 and 4
C. 1,2, and 4
D. 1,2 and 3

Answer

D

Explanation

Except `XeF_(6)`, all species have six electron pairs around the central atoms.

Only `XeF_(6)` has seven electron pairs (six bond pairs and one lone pair).

Due to presence of a lone pair, `XeF_(6)` has distorted octahedral structure, The other species have undistorted octahedral structure in accordance with VSEPR theory. (Peroxodisulphuric acid (Peroxomonosulphuric or Marshall's acid)