Statement (A): Among the carbon allotropes, diamond is an insulator. Whereas, graphite is a good conductor of electricity.
Reason (R): Hybridization of carbon in diamond and graphite are $S p^{2}$ and $S p^{3},$ respectively.

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Both A and R are correct and R is not the correct explanation of A

Both A and R are correct and R is the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

answer is C.

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Detailed Solution

Hybridization of carbon in diamond is $S p^{3} .$ In diamond four valency electrons are participate in bonding so it is bad conductor of electricity. In graphite carbon hybridization is $S p^{2} .$ Out of four electron, three electrons are participated in bonding.The fourth free electron is participating in delocalisation and increase the conductivity.