Question:
The $\mathrm{C}-\mathrm{C}$ bond length is maximum in
Correct Option: , 3
Solution:
In diamond $\mathrm{C}-\mathrm{C}$ bond have only $\sigma$ bond character while in case of graphite and fullerene $\left(\mathrm{C}_{60}\right.$ and $\left.\mathrm{C}_{70}\right) \mathrm{C}-\mathrm{C}$ bond contain double bond character. That's why diamond having maximum $\mathrm{C}-\mathrm{C}$ bond length.
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