Question

# In which of the following the repulsion is least?

A

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

All of these have same repulsion

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

## The correct option is A Lets look at all the options here. This is a trigonal bipyramidal geometry having 3 bond pairs and 2 lone pairs. Now, first we will take repulsions on the smallest angle (which is 90∘) Lets take 1st structure, If we take upper pyramid, the repulsions are: 1bp - bp, 2lp - bp, 0lp - lp In the lower pyramide, 1bp - bp, 2lp - bp, 0lp - bp Total = 2bp - bp, 4lp - bp and 0lp - bp In II structure, Upper pyramid, 3lp - bp, 0bp - bp, 0lp - lp Lower pyramid, 3lp - bp, 0bp - bp, 0lp - lp Total = 0bp - bp, 6lp - bp, 0lp - lp In III structure, Upper pyramid, 2lp - bp, 0bp - bp, 1lp - lp Lower pyramid, 2bp - bp, 1lp - bp, 0lp - lp Total → 2bp - bp, 3lp - bp, 1lp - lp Now, we know that lp−lp>lp−bp>bp−bp Now, as III structure contains 1lp - lp and other two does not. Therefore structure III will be least stable. From I and II, we can see lp - bp repulsions are more I structure II. Therefore structure I will be most stable.

Suggest Corrections
0
Related Videos
VSEPR Theory and Dipole Moment
CHEMISTRY
Watch in App
Explore more