Question

Assertion (A) Graphite conducts electricity.
Reason (R) Delocalisation of electrons occurs in graphite.

• A. Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$.
• B. Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$.
• C. $A$ is correct; $R$ is incorrect.
• D. $A$ is incorrect; $R$ is correct.

Answer 1

Answer: (A)

In graphite, each carbon atom in hexagonal ring undergoes $s p^{2}$-hybridisation and makes three sigma bonds with three neighbouring carbon atoms. Fourth electron forms $\pi$-bond. Due to delocalisation of this fourth electron, graphite conducts electricity.
Thus, both $A$ and $R$ are correct and $R$ is the correct explanation of $A$.