Question

Define functional group. Write any four organic functional groups with their formula?

Answer 1

Functional group:
The atom or the group of atoms by which the characteristic reactions of organic compounds are determined, that atom or group of atoms is called the functional group.
Some organic functional groups are as follows:
Carboxylic acid: $-COOH$
Aldehyde: $-CHO$
Alcohol: $-OH$
Ester: $-COOR$