Question

Which of the following has the highest $p\pi -p\pi$ bonding tendency?

• A. $N$
• B. $P$
• C. $As$
• D. $Sb$

Answer 1

The correct option is A $N$

Nitrogen has some unique ability to form $p\pi -p\pi$ bonds with itself and with other elements of smaller size & high electronegativity. Nitrogen exists as diatomic molecule $\left(N_2\right)$ which has a triple bond between N atoms $(N\equiv N)$.
On the other hand heavier elements of group 15 do not form $p\pi -p\pi$ bonds as their atomic orbitals are large and they diffuse. So that they cannot have effective overlapping.