Question

Which of the following will be most stable diazonium salt $R{N}_2^{+}{X}^{-}$ ?

• A. $C{H}_3{N}_2^{+}{X}^{-}$
• B. $C_6{H}_5{N}_2^{+}{X}^{-}$
• C. $C{H}_{3}C{H}_2{N}_2^{+}{X}^{-}$
• D. $C_6{H}_{5}C{H}_2{N}_2^{+}{X}^{-}$

Answer 1

Answer: (B)

$C_6{H}_5{N}_2^{+}{X}^{-}$

Diazonium salt containing aryl group directly linked to the nitrogen atom is most stable due to resonance stabilisation between the benzene nucleus and N-atom.