Which one of the following statements about diamond and graphite is not correct?
1) Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure.
2) Both physical and chemical properties of diamond and graphite are different.
3) Graphite is soft but diamond is hard.
4) Graphite is a good conductor of electricity while diamond is not.
2) Both physical and chemical properties of diamond and graphite are different.