The elements of VA group direcly combines with halogens and form trihalides of the type `MX_(3) (M-VA` group element, X- halogen). All the trihalides are stable except `NCl_(3),NBr_(3)` and `NI_(3)`.
The unstable nature of these halides is due to

Options

A. Low polarity of `N-X` bond and large difference in the size of N and halogen atoms
B. High polarity of N-H bond and large difference in the size of N and halogen atoms
C. High bond dissociation energy of N-X bond and low polarity of N-X bond
D. Increase of electronegativity of halogen atoms for Fluorine to iodine

Answer

A

Explanation

`NF_(3)` to `NI_(3):`Lewis basic nature increases