Diamond does not conduct electricity, because - (1) It's structure is very compact (2) It is of crystalline nature (3) There are only carbon atoms present in it (4) No free electrons are present in it
(4) No free electrons are present in it Explanation: Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other car-bon atoms. There are no free electrons or ions in diamond; so it does not conduct electricity. Except for most blue diamonds, which are semiconductors, diamonds are good electrical insulators.