Although `PF_5, PCl_5` and `PBr_5` are known, the pentahalides of nitrogen have not been observed.
Phosphorous has lower electronegativity than nitrogen.

Options

A. Assertion `(A)` is true , Reason `( R)` is also true , Reason `( R)` is the correct explanation for Assertion `(A)`.
B. Assertion `(A)` is true , Reason `( R)` is true , Reason `( R)` is not the correct explanation for Assertion `(A)`.
C. Assertion `(A)` is true , Reason `(R )` is false.
D. Assertion `(A)` is false , Reason `( R)` is true.

Answer

B

Explanation

`(A)` and `( R)` are both correct but `( R)` is not correct explanation for `(A)`. Nitrogen does not form pentahalides because it does not have `d-"orbitals"`. The electronegativity of `P` is less than that of `N`.