Boron has an extremely high melting point because of

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Its ionic crystal structure

Strong binding forces in the covalent polymer.

Strong van der Waals forces between its atoms

Allotropy

answer is D.

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Detailed Solution

Boron has a high melting point of 2352 K because of its small atomic size, it forms strong covalent bonds with the adjacent atoms. Thus boron atoms have a close packed structure in its solid state therefore a large amount of heat is required to break the bonds between Boron atoms.

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