Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The most effective $\pi$-bond forms when orbitals are of similar energy and size, leading to good overlap. $2p$ orbitals are smaller and have lower energy than $3d$ orbitals. The $2p\pi -3d\pi$ overlap is generally more effective than $3p\pi -3p\pi$ or $3d\pi -3d\pi$ due to better directional properties and energy matching for certain elements.

The correct answer is A.