Question

(a) What are hydrocarbons? Give examples.
(b) Give the structural differences between saturated and unsaturated hydrocarbons with two examples each.
(c) What is a functional group? Give examples of four different functional groups

Answer 1

(a) Compounds of carbon and hydrogen are called hydrocarbons. Example, methane, ethane etc.
(b) Saturated hydrocarbons contain carbon-
carbon single bonds. Unsaturated
hydrocarbons contain atleast one carbon-
carbon double or triple bond.

|| structures given in the image ||

(c) Functional group: An atom/group of atoms joined in a specific manner which is responsible for the characteristic chemical properties of the organic compounds. Examples are hydroxyl group (-OH), aldehyde group (—CHO), carboxylic group (—COOH) etc.

Answer 2

compounds of carbon and hydrogen are called hydrocarbons.
e g . methane ,ethane 
saturated - carbon-carbon single bond
unsaturated - carbon-carbon double or triple bond
  
a functional group is defined as an atom or a group of atoms in a molecule that gives the molecule its physical and chemical properties
:  alcohol,
aldyehyde
ketone
carboxylic acid
halogen-(chloro/bromo)