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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb029

Select the correct statement(s) about allotropes of carbon.

ADiamond is a good conductor of electricity.
BThe layers in graphite are held together by van der Waals forces.
CAll carbon atoms in graphite are $s p^{3}$ hybridised.
D $C X_{60}$ contains 12 pentagonal and 20 hexagonal rings.

Answer: B, D

Buckminsterfullerene

C X_{60}

has 12 five-membered and 20 six-membered rings, so A is true. Graphite layers are weakly attracted, so B is true. In diamond all four valence electrons are used in

σ

bonds so it is an insulator, so C is false. Graphite carbons are

s p^{2}

, so D is false.

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