What is 'C' in the given sequence of reactions?





In this reaction sequence, an aromatic compound undergoes a reaction with NaNO2/HCl, followed by hydrolysis with H2O/H3PO4, leading to the formation of a carboxyl group (COOH) as product 'C'.
In the given reaction sequence, the structure of Y would be:

In a messenger RNA molecule, untranslated regions (UTRs) are present at:
I. 5' end before start codon
II. 3' end after stop codon
III. 3' end before stop codon
IV. 5' end after start codon