The C–C bond length is maximum in:

Question

Canvas Classes · Accepted Answer

C–C bond lengths in allotropes of carbon:

| Allotrope | Bond type | Bond length |
|---|---|---|
| Diamond | Pure  (sp³) | 154 pm (longest) |
| Graphite | Delocalized (sp²) | 142 pm |
|  | Mixed (sp²) | 143.5 pm (6-6) / 145.1 pm (6-5) |
|  | Mixed (sp²) | ~143–147 pm |

Pure single bonds (sp³ hybridization in diamond) are the longest C–C bonds.

Answer: Option (4) — diamond

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