Write the preparation of benzoic acid from the following: Dry ice

Grignard reagents react with carbon dioxide (dry ice) to form salts of carboxylic acids which in turn give corresponding carboxylic acids after acidification with mineral acid. Here benzoic acid is formed on dry ice.

Write the preparation of benzoic acid from the following: Styrene

Aromatic carboxylic acids can be prepared by vigorous oxidation of alkylbenzenes with chromic acid or acidic or alkaline potassium permanganate. The entire side chain is oxidised to the carboxyl group irrespective of the length of the side chain. So, here Phenyl ethene by reduction gives ethylbenzene. Ethylbenzene on vigorous oxidation with alkaline potassium permanganate gives benzoic acid.

Write the preparation of benzoic acid from the following: Benzamide

Nitriles are hydrolysed to amides and then to acids in the presence of H + or OH - as catalyst. Mild reaction conditions are used to stop the reaction at the amide stage

Complete and rewrite the balanced chemical equation for the following reactions: Acetone + phenylhydrazine → H +

Acetone reacts with phenyl hydrazine to give addition product which on dehydration gives acteone phenyl hydrazone. This reaction occurs in the presence of an acid catalyst.

Complete and rewrite the balanced chemical equation for the following reactions: Benzaldehyde → 50 % KOH

Two molecules of benzaldehyde reacts in the presence of 50% KOH, the products formed are benzyl alcohol and potassium benzoate. The reaction is called cannizzaro reaction.