Assertion: among the carbon allotropes, diamond is an insulator, where as graphite is a good conductor of electricity .
Reason: hybridization of carbon in diamond and graphite are SP³ and SP² , respectively.

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Both assertion and reason are correct and the reason is the correct explanation for the assertion.

Both assertion and reason are incorrect

Assertion is incorrect statement, but the reason is correct.

Both assertion and reason are correct but the reason is not the correct explanation for the assertion.

answer is B.

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Detailed Solution

In diamond, each C-atom is covalently bonded to four other C-atoms to give a tetrahedral unit . So it show SP3 hybridisation. So diamond is an insulator. Graphite each c-atom is covalently bonded to three c-atom to give trigonal geometry. Each c-atom in graphite is SP² – hybridized. Fourth electron is free to move structure of graphite.

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