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

Explanation

A single atom or a group of atoms that determines the chemical nature of an organic compound is called a functional group. The functional groups in ethanol and ethanoic acid are alcohol and carboxylic acid respectively. Their structures are as follows:
`CH_3-CH_2-OH` ethanol,
`CH_3-overset(O)overset(||)(C)-OH, -OH, -overset(O)overset(||)(C )-O-H` ethanoic acid.