 
       
      
    An aromatic compound 'A' having molecular formula  on treating with aqueous ammonia and heating forms compound 'B' on reaction wit molecular bromine and potassium hydroxide provides compound 'c' having molecular formula 
 the structure of 'A; is:
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Esterification of carboxylic acid -
⇒ Carboxylic acid with alcohols or phenols forms esters in the presence of catalyst H2SO4 / HCl
⇒ It's a kind of nucleophilic acyl substitution.
⇒ Involves cleavage of C - OH bond.
- wherein
As we have learned when Aq NH3 acts as a reagent .
A has molecular formula C7H6O2 so the answer will be -
(Benzoic acid is 'A' )
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