Explain the difference in properties of diamond and graphite on the basis of their structures.
Diamond  | Graphite  | 
It has a crystalline lattice  | It has a layered lattice  | 
It acts as an electrical insulator.  | It is a good conductor of electricity.  | 
It is made up of tetrahedral units.  | It has a planar geometry.  | 
The C-C bond length in diamond is 154pm.  | The C-C bond length is 141.5pm.  | 
It has a rigid covalent bond network which is difficult to break.  | It is quite soft and its layers can be separated easily.  | 
Each carbon is sp3 hybridized.  | Each carbon is sp2 hybridized.  |