State the meaning of functional group in a carbon compound. Write the functional group present in (i) ethanol and (ii) ethanoic acid and also draw their structures.

Functional group in a carbon compound may be defined as an atom or group of atoms or reactive part which is responsible for the characteristic properties of the compounds.The function group of ethanol(CH3CH2OH)is alcohol, i.e.,−OHgroup.The functional group of ethanoic acid(CH3COOH)is carboxylic group, i.e.,–COOH.