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

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

Which of these have double bond (=)?

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

Which is not an allotrope of carbon?

Which of the following catalytic systems is used for the reduction of unsaturated hydrocarbon to saturated hydrocarbon?