Which is the hardest allotrope of carbon?

Diamond

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Graphite

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Graphene

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Coal

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Solution

The correct option is A. Diamond
It has a crystalline lattice in which each carbon atom is $s p^{3}$ hybridized.
The structure extends in space and produces a rigid 3-D network of carbon atoms with directional covalent bonds throughout the lattice.
It is very difficult to break extended covalent bonding which makes diamond the hardest substance on the earth.

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