Which one of the following statements is not correct ........

General Science (NDA) Chemistry

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Which one of the following statements is not correct?`

All carbons in diamond are linked by carbon-carbon single bond.

Graphite is layered structure in which layers are held together by weak vander waals forces.

Graphite layers are formed by hexagonal rings of carbon atoms.

Graphite layers are held together by carbon-carbon single bond.

Explanation:

In graphite, each carbon atom is bonded to three other carbon atoms in the same plane giving a hexagonal array. One of these bonds is a double-bond, and thus the valency of carbon is satisfied. Graphite structure is formed by the hexagonal arrays being placed in layers one above the other.