The C-C bond length is maximum in

Question:

The $\mathrm{C}-\mathrm{C}$ bond length is maximum in

  1. graphite

  2. $C_{70}$

  3. diamond

  4. $\mathrm{C}_{60}$


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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