Question

The compound(s) with TWO lone pairs of electrons on the central atom is(are)
BrF5; ClF3; XeF4; SF4

Answer 1

Answer:

Explanation:

ClF3

Because Cl-F joined to each other with single bond results in the formation of 3 bond pair and Cl has 7 e- in it's valence shell so there are 2 lone pairs.

XeF4

Xe – 8 e- in it's valence shell

F – 7 e- in it's valence shell

So there is 4 B.P. and 2 L.P.

Answer 2

Question:

The compound(s) with TWO lone pairs of electrons on the central atom is(are)

BrF5; ClF3; XeF4; SF4    [JEE Advanced 2016]

Solution:

a) BrF5 :  One lone pair on central atom Br.  (Square pyramidal)

b) ClF3 : Two lone pair on cental atom Cl. (T - shaped)

c) XeF4 :  Two lone pair on central atom Xe. (Square planar)

d) SF4 : One lone pair on central atom S.   (See-saw shaped)

Hence, option b and option c are correct.

i.e Only, ClF3 & XeF4 contains two lone pair of electrons on central atom.

Note: Lone pairs are shown in the figures attached.