Choose the correct alternative from the following option for assertion or reason given below.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is B.

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Detailed Solution

Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity.

Hybridization of carbon in diamond and graphite are sp3 and sp2, respectively.

Diamond has strong covalent bonds and valence electrons are not free to move. Hence, diamond is an insulator. Graphite has delocalised molecular orbitals and delocalised electrons have freedom to move in the delocalised molecular orbitals. Hence, graphite is a good conductor of electricity.

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

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