Which of the following is the correct statement

Options

A. Between `NH_3 and PH_3 NH_3`, is a better electron donor because the lone pair of electrons occupies spherical s-orbital and is less directional
B. Between `NH_3 and PH_3, PH_3` is a better electron donor because the lone pair of electrons occupies `sp^3` orbital and is more directional.
C. Between `NH_3` and `PH_3, NH_3` is a better electron donor because the lone pair of electrons occupies `sp^3` orbital and is more directional.
D. Between `NH_3` and `PH_3, PH_3` is a better electron donor because the lone pair of electrons occupies spherical s-orbital and is less directional.

Answer

C

Explanation

In case of group 15(nitrogen group), on moving down the group there occursa decrease in bond angle of metal hydrides. This decrease in bond angle of metal hydrides of this group may be attributed to the increased p-character in the bond pair which results in more s-character in lone pair orbital. The directional character is more for `sp^3` hybrid orbital than a s-orbital,