Azo dye test for aromatic primary amines (diazotisation, then beta-naphthol)

1. A.
2. B.
3. C.
4. D.

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1. A.
   $A = HNO_{3}/H_{2}SO_{4}$; $B$ = phenol
2. B.
   $A = NaNO_{2}+HCl,\ 0-5^{\circ}C$; $B$ = aniline
3. C.
   $A = NaNO_{2}+HCl,\ 0-5^{\circ}C$; $B$ = 1-naphthol ($\alpha$-naphthol)
4. D.
   $A = NaNO_{2}+HCl,\ 0-5^{\circ}C$; $B$ = 2-naphthol ($\beta$-naphthol)

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1. A.
   Nitrobenzene: (i) $Sn/HCl$, (ii) $NaNO_{2}/HCl$, (iii) $\beta$-naphthol, $NaOH$
2. B.
   Benzenesulphonic acid: (i) $SOCl_{2}$, (ii) $NH_{3}$, (iii) benzyl chloride
3. C.
   Benzonitrile: (i) 70% $H_{2}SO_{4}$, (ii) $PCl_{5}$, (iii) aniline
4. D.
   Aniline: (i) $HCl$, $NaNO_{2}$, (ii) toluene

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