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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb192

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

AIn diamond each carbon is $s p^{3}$ hybridised and bonded tetrahedrally to four others.
BGraphite is harder than diamond because of its delocalised electrons.
CIn $C X_{60}$ every carbon atom is shared by one pentagon and two hexagons.
DIn graphite each carbon uses three electrons for $σ$ bonds and one for a delocalised $π$ system.

Answer: A, C, D

The first three describe the established structures (in

C X_{60}

each vertex has one 5-ring and two 6-rings). Diamond, with its rigid 3D network of strong

σ

bonds, is the hardest natural substance; graphite is soft. So the last statement is false.

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