JEE Main 2016 · 10 Apr · Shift 1 · Chemistry Q45

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ChemistrySingle correct+4 / -1Question 45 of 90

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.

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.

Answer and worked solution

Official answer: A

In diamond every valence electron is in a localised $sp^3$ σ bond, so it does not conduct. In graphite each $sp^2$ carbon leaves one electron in a delocalised π system, which carries current. The reason explains the assertion.

Topics:Group 14 Hybridisation

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JEE Main 2016 · 10 Apr · Shift 1, Chemistry question 45