Question:

Assertion : Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity.
Reason : Hybridization of carbon in diamond and graphite are \(sp^3\) and \(sp^2\), respectively.

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Both statements are true; ask whether hybridization by itself explains conductivity (it is the delocalised electrons that do).
Updated On: Nov 11, 2026
  • Both assertion and reason are correct, and the reason is the correct explanation for the assertion.
  • Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.
  • Assertion is incorrect statement, but the reason is correct.
  • Both assertion and reason are incorrect.
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The Correct Option is B

Solution and Explanation

Assertion: diamond has no free electrons so it is an insulator; graphite has delocalised \(\pi\) electrons within its layers so it conducts - true.
Reason: carbon is \(sp^3\) in diamond and \(sp^2\) in graphite - true.
However, the electrical behaviour is explained by availability of free (delocalised) electrons, not directly by the hybridization state, so the reason is not the correct explanation.
Answer: (2) Both assertion and reason are correct, but the reason is not the correct explanation for the assertion.
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