JEE Main · 2021 · 18 Mar 2021 · Shift 1 · Compounds Containing Nitrogen

Considering the above reaction, X and Y respectively are:

(A)(see structures)
A
B
(B)(see structures)
A
B
✓ Correct
(C)(see structures)
A
B
(D)(see structures)
A
B

Answer: (B)

Solution

Aniline treated with

NaN O_{2}

and

HCl

273 - 278 K

is diazotised, so X is benzenediazonium chloride; the low temperature is what keeps it from hydrolysing to phenol. A diazonium ion is a weak electrophile and attacks only strongly activated rings, and

N, N

-dimethylaniline offers such a ring. Coupling occurs at the position para to the dimethylamino group, the most activated free position. X is benzenediazonium chloride and Y is

p

-(N,N-dimethylamino)azobenzene.

JEE Main · 2021 · 18 Mar 2021 · Shift 1 · Single correct option

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