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Question: 41. The correct order of resonance energy is/are:...

  1. The correct order of resonance energy is/are:
A
B

< <

C

Both (1) and (2)

D

All of these

Answer

Option (3) Both (1) and (2)

Explanation

Solution

Explanation of the Solution:

  1. For five‐membered heteroaromatics, the overall resonance stabilization is highest for thiophene (S), then pyrrole (NH), and lowest for furan (O).
  2. For fused benzene rings, the overall resonance energies increase as the number of rings increase in the order: benzene < naphthalene (two fused rings) < anthracene (three linearly fused rings) < phenanthrene (three fused rings with angular fusion).

Both these orderings are correct.