Which one of the following statements is not correct?

Which one of the following statements is not correct?

[amp_mcq option1=”All carbons in diamond are linked by carbon-carbon single bond.” option2=”Graphite is layered structure in which layers are held together by weak van der Waals forces.” option3=”Graphite layers are formed by hexagonal rings of carbon atoms.” option4=”Graphite layers are held together by carbon-carbon single bond.” correct=”option4″]

This question was previously asked in

UPSC NDA-2 – 2018

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The statement that graphite layers are held together by carbon-carbon single bonds is incorrect. Graphite layers (graphene sheets) are themselves held together by covalent bonds within the plane, but the forces *between* these layers are weak van der Waals forces.

– Diamond has a 3D tetrahedral structure where each carbon atom is covalently bonded to four other carbon atoms by single bonds (sp³ hybridization).
– Graphite has a layered structure. Each layer consists of carbon atoms arranged in hexagonal rings, with strong covalent bonds (sp² hybridization) within the layer.
– The layers in graphite are held together by relatively weak van der Waals forces. This allows the layers to slide easily over each other, giving graphite its properties as a lubricant and its softness.

The delocalized electrons within the layers of graphite allow it to conduct electricity, unlike diamond, which is an electrical insulator. The carbon-carbon bond length within a graphite layer is about 0.142 nm, while the distance between layers is about 0.335 nm.

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