A, b तथा C की सरंचना किजीय --- `C_6H_5NO_2 overset(Fe//HCI)(to)Aunderset(273 K)overset(NaNO_2+HCI)(to)Bunderset(Delta)overset(H_2O //H^+)(to)C`

Explanation

`C_(6)H_(5)NO_(2)overset(Fe//HCl)underset(अपचयन)to underset(एनीलिन (A ))(C_(6)H_(5)NH_(2)) overset(NaNO_(2) + HCl)underset(273 K) to underset(बेंजीन डाइऐजोनियम क्लोराइड (B))(C_(6)H_(5)overset(oplus)N-=NCl)overset((H_(2)O)//H^(+))underset(Delta)tounderset(फिनोल (C))(C_(6)H_(5)OH`