Question

Incorrect statement among the following is

• A. All C – C bond lengths in benzene are same
• B. All C – C bond lengths in Naphthalene are same
• C. Naphthalene has three resonance structures
• D. has five hyper conjugation Hydrogen's

Answer 1

Answer: (B)

All C – C bond lengths in Naphthalene are same

Answer 2

Statement A is correct: Benzene has equivalent C-C bonds due to resonance, all measuring 139 pm.

Statement C is correct: Naphthalene exhibits resonance with three contributing structures.

Statement D is correct: The molecule shown has 5 hyperconjugation hydrogens (3 from the methyl group and 1 each from two adjacent ring carbons).

Statement B is incorrect: Naphthalene has different C-C bond lengths (approx. 136 pm, 139 pm, and 140 pm), not all the same.