a (a) When aniline is treated with $HN{O_2}$ at $0-5\,^oC$ then diazonium salt is formed and by the coupling of diazonium salt and phenol azo dyes are prepared.
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$9.3 \mathrm{~g}$ of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume $100$% yield/ conversion) is . . . . . $g$. (nearest integer)
Indicate which nitrogen compound amongst the following would undergo Hofmann's reaction (i.e. reaction with $B{r_2}$ and strong $KOH$) to furnish the primary amine ($R - N{H_2}$)