In diamond, each carbon atom is bonded to how many other carbon atoms?

In graphite, each carbon atom is bonded to three other carbon atoms

A hydrocarbon in which two carbon atoms are joined by a double bond is called as an :

Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. This property is called

The elemental composition of diamond is

For the selling of diamonds, the unit of weight is carat. One carat is equal to –