A: The melting point of diamond is high even it is covalent compound
R: Diamond has three-dimensional network involving strong C-C bonds which are very difficult to break

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A is true R is true and R is correct explanation of A

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answer is A.

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Detailed Solution

Diamond has a giant molecular perfect tetrahydron structure. And a 3D solid network of strong covalent bonds. Dut to this strong covalent bonding, it requires very high energy to separate the atoms

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