Which of the following statement is correct?

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Diamond is the metastable allotrope of carbon

Diamond being thermodynamically less stable than graphite can convert into graphite spontaneously under ordinary conditions

Formation of diamond (from graphite) is favoured by high pressure and temperature in accordance with Le-chatelier's principle

Diamond has theoretically more efficient packing than graphite

answer is A.

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Detailed Solution

Diamond is the metastable allotrope of carbon-based each C-atom forms a tetrahedral unit through covalent bonds with four other C-atoms. Each C atom has a ${sp}^{3}$ hybrid.

Le Chatelier principle shows that diamond formation from graphite is encouraged under high pressure settings because when pressure increases, the equilibrium moves in that direction, leading to a reduction in volume or a rise in density.

Hence the correct option is a and c.

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