Give uses of carboxylic acid compounds.

(N/A) $(i)$ Methanoic acid is used in rubber,textile,dyeing,leather,and electroplating industries.
$(ii)$ Ethanoic acid is used as a solvent and as vinegar in the food industry.
$(iii)$ Hexanedioic acid is used in the manufacture of nylon-$6, 6$.
$(iv)$ Esters of benzoic acid are used in perfumery.
$(v)$ Sodium benzoate is used as a food preservative.
$(vi)$ Higher fatty acids are used for the manufacture of soaps and detergents.