The bond angle in `NF_(3)(102.3^(@))` is smaller than `NH_(3)(107.2^(@))`. This is because of

Options

A. large size of F compared to H
B. large size of N compared to F
C. opposite polarity of N in the two molecules
D. small size of H compared to N

Answer

C

Explanation

In `NF_(3)` molecules, the N-F bond pair is drawn more towards the more electronegative F-atom. But in `NH_(3)` molecule, the N-H bond is drawn more towards the more electronegative N-atom, therefore, the extent of bp-bp repulsion in `NH_(3)` is more than that in `NF_(3)`. As a consequence, bond angle in `NH_(3)(107.2^(@))` is greatert han that in `NF_(3)(102.3^(@))`.