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See explanation

Explanation:

The functional group is an atom, group of atoms or bond which is responsible for the chemical reactions of the members of a series of organic compounds.

The chemical properties of various groups of compounds in organic chemistry depends of the concept of functional groups. They help us to classify molecules into families or groups based on a common general molecular formula.

The nature of the functional group determines the overall chemical properties of the molecule such as polarity, water solubility, and so on. Chemical reactions occur only at the functional group.

For instance, for the reaction below, reaction occurs at the functional groups as follows;

CH3COOH + CH3OH > CH3COOCH3

Also, during amide formation, reaction occurs between the carbonyl chloride and an amine at the respective functional groups as shown;

CH3COCl + CH3NH2 > CH3CONHCH3 + HCl