Question

Which of the following element cannot form a $p\pi -d\pi$ bond?

• A. N
• B. P
• C. As
• D. All of the above

Answer 1

The correct option is A N

Nitrogen cannot form a $p\pi -d\pi$ bond due to the unavailability of d-orbitals.
Heavier elements $(P,As)$ can form a $p\pi -d\pi$ bond, e.g. $R_{3}P=O,P(C_2{H}_5{)}_3,As(C_6{H}_5{)}_3$ etc. Hence option (a) is correct.