The shape of a moleculs is determined by electron pair repulsions in the valence shell A.lp occupies a larger space than a bp because it is not shared by two nuclei The the lp lp repulsion is greater than the lp-lp repulsion, which in trun is greater the lp-lp repulsion. The presence of lp causes distortion of bond angles hence, a daviation from an ideal shape THe extent of distortion depends upon the orientation of the lp's around the central atom In a trigonal bipyramid, the lp's occupy equatorial positions than the apical ones In `AB_(n)` type molecules, as the `EN` of A increases, the bp's come closer and the repulsion between them increases. On the other hand, as `EN` of `B` increases, the lp s get farther and repulsion decreases
In which of the following molecules is the bond angle largest ? .

Options

A. `PF_(3)`
B. `PCI_(3)`
C. `PBr_(3)`
D. `PI_(3)`

Answer

D

Explanation

For `AB_(x)` type molecule f the `EN` of atom `B` decreases the bond angle `(B- A -B)` increases Hence bond angle of `PI_(3)` is the largest .