Question:


Considering the above reaction, X and Y respectively are :

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Aniline gives benzenediazonium chloride with NaNO2/HCl at 273-278 K; this couples with N,N-dimethylaniline at the para position to give an azo dye.
Updated On: Nov 4, 2026
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The Correct Option is B

Solution and Explanation

Step 1: Aniline with NaNO2/HCl at 273-278 K undergoes diazotisation to give benzenediazonium chloride, \(\mathrm{C_6H_5N_2^+Cl^-}\) (X). The low temperature prevents decomposition to phenol.
Step 2: The diazonium ion is a weak electrophile and attacks the activated ring of N,N-dimethylaniline (azo coupling). The strongly activating \(\mathrm{-N(CH_3)_2}\) group directs to the para position (less hindered), giving 4-(N,N-dimethylamino)azobenzene, \(\mathrm{C_6H_5{-}N{=}N{-}C_6H_4{-}N(CH_3)_2}\) (Y).
So X = benzenediazonium chloride and Y = the para-coupled azo compound, option (2).
Answer: (2) X = C6H5N2+Cl-, Y = p-(dimethylamino)azobenzene
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