Cinnamic acid is formed when $C_6H_5CHO$ condenses with $(CH_3CO)_2O$ in the presence of:

What is glacial acetic acid?

Assertion $(A)$: Carboxylic acids are more acidic than Phenols.
Reason $(R)$: Resonance structures of carboxylate ion are equivalent,while resonance structures of phenoxide ion are not equivalent.

What is the major product formed upon the sulfonation of benzoic acid?

When ethane-$1, 2$-dioic acid is heated with conc. $H_2SO_4$,it gives

Propionic acid with $Br_2/P$ yields a dibromo product. Its structure would be: