question_answer

Which of the following will be most stable diazonium salt \[RN_{2}^{+}{{X}^{-}}?\] [AIPMT 2014]

A)  \[C{{H}_{3}}N_{2}^{+}{{X}^{-}}\]       

B)  \[{{C}_{2}}{{H}_{5}}N_{2}^{+}{{X}^{-}}\]

C)  \[C{{H}_{3}}C{{H}_{2}}N_{2}^{+}{{X}^{-}}\]    

D)  \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}N_{2}^{+}{{X}^{-}}\]

Correct Answer: B

Solution :

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