Question

Select which of the option is incorrect using following diagrams:

(Take z axis as inter-nuclear axis)

• A. a, b
• B. b, c
• C. c, d
• D. d, a

Answer 1

The correct option is D

d, a

Let's see both the diagrams one by one. In first diagram, two $2P_z$ orbitals are forming a $\sigma 2P_z$.

$\sigma$ bond is only possible when both are on inter-nuclear axis.

That's why, diagram I can be represented as

So, option (a) is right.

Let's take diagram II now.

Two electrons in 2s orbitals are forming a $\sigma$2s

Therefore only possibilities are:

So, option (d) is right