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Question

Which of the following is the carbon allotrope having a tetrahedral structure?

This question was previously asked in
RRB Group D 2025 Question Paper (18-Aug-2026) (Shift 1)
The correct answer is

Diamond

In diamond, each carbon atom is sp3 hybridised and forms four equivalent covalent bonds directed toward the corners of a regular tetrahedron, generating a rigid three-dimensional network.

This uniform tetrahedral geometry (bond angle 109.5 degrees) explains diamond's exceptional hardness and high melting point.

Graphite is layered with sp2 carbons in planar hexagons; graphene is a single such planar sheet; fullerenes are closed spheroidal cages of sp2 carbon.

Hence, the tetrahedrally structured carbon allotrope is diamond.

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