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Chemistry Question on Amines

Which of the following will be most stable diazonium salt (R N2+ X−)(R\, N^{+}_{2}\,X^{-}) ?

A

CH3N2+X−CH_3 N_2^+X^-

B

C6H5N2+X−C_6H_5 N_2^+X^-

C

CH3CH2N2+X−CH_3 CH_2 N_2^+X^-

D

C6H5CH2N2+X−C_6H_5 CH_2 N_2^+X^-

Answer

C6H5N2+X−C_6H_5 N_2^+X^-

Explanation

Solution

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. Diazonium ion act as a electrophile. [Resonance structure of benzene diazonium ion]