Question

differentiate between graphite and diamond on the basis of ductility, malleability, sonorous, physical state, hardness, tensile strength?

Answer 1

In diamond one carbon atom is bonded with four other carbon atoms and they do not form layers. So there's no chance of sliding over one another. There's strong covalent bond. That's why diamond is hard.
And there is no electron left to carry charges.
In graphite one carbon atom is bounded with three other carbon atoms and they form layers of carbon atoms. There is weak attraction between the layers so slight force is enough to slide over one another. That's why graphite is soft