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.

(N/A) An atom or a group of atoms that determines the chemical properties of organic compounds is called a functional group. They confer specific properties to the compound,regardless of the length and nature of the carbon chain.

Organic compound	Functional group and Structure
$(i)$ Ethanol	Alcohol group $(-OH)$: $CH_{3}-CH_{2}-OH$
$(ii)$ Ethanoic acid	Carboxylic acid group $(-COOH)$: $CH_{3}-C(=O)OH$