Sodium salts of some acids are very useful as food preservatives. Suggest a few such acids.

(N/A) Sodium salts of some acids are very useful as food preservatives. Some examples of such acids are as follows:
$(i)$ Benzoic acid: Its sodium salt,sodium benzoate,is a common preservative in acidic or acidified foods such as fruits,juices,and pickles.
$(ii)$ Sorbic acid: Its sodium salt is a food additive used predominantly in meats,poultry,and soft drinks.
$(iii)$ Propanoic acid: Its sodium salt,sodium propanoate $(CH_3CH_2COONa)$,is used in bakery products as a mold inhibitor.