# 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.