(A) The carbon-carbon $(C-C)$ bond length in diamond is $154 \, pm$. In graphite, the $C-C$ bond length is $141.5 \, pm$ due to resonance. In naphthal

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(A) The carbon-carbon $(C-C)$ bond length in diamond is $154 \, pm$. In graphite, the $C-C$ bond length is $141.5 \, pm$ due to resonance. In naphthalene and fullerene, the bond lengths are intermediate between single and double bonds. Therefore, the $C-C$ bond length is maximum in diamond.