A) Carbon has some really unique properties which help to form large number of compounds.....
1) Catenation :- It is the ability of carbon to form long chains, branched chains or rings.
2) Smaller nucleus helps it to attract more number of electrons.
b)Saturated hydrocarbon :-
1)In this type, the carbon atoms are connected by a single covalent bond.
2)These single bonded compounds are called as Alkene
3)They don't undergo hydrogenation.
Unsaturated hydrocarbon :-
1) In this type, the carbon atoms are connected by multiple bonds like double bonds (=) or triple bond (≡).
2)These double bounded compounds are called Alkene and triple bounded compounds are called Alkynes .
3)They can be hydrogenated by passing hydrogen gas as they have less hydrogen than saturated hydrocarbons.