A molecule of an organic compound can be thought of as having two portions: a radical with an attached functional group. What is the correct definition of a functional group

B: As organic molecules all contain C, H and O atoms in similar

bonding situations, the differences in their chemical behaviour (function) is

largely governed by the differences in structure of small groups of atoms that

are bonded differently or contain atoms other than C, H & O. These groups of

atoms are known as the functional group.