Question

Define -saturated and unsaturated hydrocarbon?

Answer 1

Saturated hydrocarbons  are who are combined with a single carbon to carbon bond they are usually called alkanas
Unsaturated hydrocarbons are who are combined with a double or triple carbon to carbon bond are usually called alkenes and alkynes respectively   
Hope it helps u... :)

Answer 2

Saturated Hydrocarbon

In this type of hydrocarbon , the carbon atom are connected by a single covalent bond . These are called Alkane and general formula C$n$H$2n+2$ where n = 1,2,3 etc . These are less reactive as they contain strong bonds .

Eg : CH$4$

Unsaturated Hydrocarbon

In this type of hydrocarbon , the carbon atom are connected b double or triple bonds . The double bonded compounds are called Alkenes and general formula C$n$H$2n$ and triple bonded compounds are called Alkynes and has general formula C$n$H$2n-2$ . These are more reactive as they contain bonds which are easily broken .

Eg : CH$2$ = CH$2$