Question

Which of the following atomic orbital overlapping are not allowed?

• A. All of these
• B. (P) (Q) (R)
• C. (P) (R) (T)
• D. (Q) only

Answer 1

The correct option is B (P) (Q) (R)

Orbitals can overlap either along the internuclear axis or perpendicular to the internuclear axis. As (S) is the overlap along the internuclear axis and (T) is the overlap, perpendicular to the internuclear axis. Hence, only (S) and (T) overlapping are allowed and P,Q,R are not allowed.