Question

Which of the following is correct about the following compound

(Naphthalene)

• A. All the C-C bond length are same
• B. C1–C2 bond length is shorter than C2–C3 bond length
• C. C1–C2 bond length is greater than C2–C3 bond length
• D. All the C-C bond length are equal to C-C bond length of benzene

Answer 1

Answer: (B)

C1–C2 bond length is shorter than C2–C3 bond length

Answer 2

C1 – C2 - is shorter because it is double bond in two of three resonance strucutre ; C2–C3 is a single bond in two of three resonance strucutres.