Q. Which of the following is the correct and increasing order of lone pair of electrons on the central atom?
BITSATBITSAT 2018
Solution:
The number of lone pairs of electrons on central atom in various given species are
Species
Number of lone pairs on central atom
$IF_7$
nil
$IF_5$
1
$ClF_3$
2
$XeF_2$
3
Thus the correct increasing order is
$\underset{ 0}{IF_7 } < \underset{ 1}{IF_5 }< \underset{ 2}{ClF_3 } < \underset{3}{ X eF_2}$
| Species | Number of lone pairs on central atom |
|---|---|
| $IF_7$ | nil |
| $IF_5$ | 1 |
| $ClF_3$ | 2 |
| $XeF_2$ | 3 |