Which one of the following reaction sequences will give an azo dye ? (A) NO2 (i) Sn/HCl (ii) NaNO2/HCl (iii) -naphthol, NaOH (B) SO3H (i) SOCl2 (ii) NH3 (iii) CH2–Cl (C) NH2 (i) HCl/NaNO2 (ii) CH3 (D)

Question

Which one of the following reaction sequences will give an azo dye ?

(A) NO2 (i) Sn/HCl (ii) NaNO2/HCl (iii) -naphthol, NaOH
(B) SO3H (i) SOCl2 (ii) NH3 (iii) CH2–Cl
(C) NH2 (i) HCl/NaNO2 (ii) CH3
(D) CN (i) 70% H2SO4 (ii) PCl5 (iii) NH2

Prashant Kotian · Accepted Answer

Correct answer: A. NO2      HCl / Sn NH2       HCl / NaNO2 N2Cl–  + ONa  OH N=N–Ph   ONa N=N–Ph

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