Question

Which of the following is/are the neccessary conditions for resonance?

• A. The position of all the atomic nuclei in the resonating structures are not the same
• B. Conjugated system
• C. Each resonating structure should have same number of paired and unpaired electrons
• D. Interconvertible lone pairs and bond pairs.

Answer 1

Answer: (B), (C), (D)

The correct options are
B Conjugated system
C Each resonating structure should have same number of paired and unpaired electrons
D Interconvertible lone pairs and bond pairs.

Conditions for resonance:
1. All resonating structures must have the same arrangement of atomic nuclei.
2. Conjugated system
3. Same number of paired and unpaired electrons in each resonating structure
4. Interconvertible lone pairs and bond pairs.

Hence, options (b) and (c) are correct.