In the chemical reactions, the compounds $'A'$ and $'B'$ respectively are
A
nitrobenzene and fluorobenzene
B
phenol and benzene
C
benzene diazonium chloride and fluorobenzene
D
nitrobenzene and chlorobenzene
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C
benzene diazonium chloride and fluorobenzene
c
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$STATEMENT-1$: Aniline on reaction with $\mathrm{NaNO}_2 / \mathrm{HCl}$ at $0^{\circ} \mathrm{C}$ followed by coupling with $\beta$-naphthol gives a dark blue coloured precipitate. and
$STATEMENT-2$: The colour of the compound formed in the reaction of aniline with $\mathrm{NaNO}_2 / \mathrm{HCl}$ at $0^{\circ} \mathrm{C}$ followed by coupling with $\beta$-naphthol is due to the extended conjugation.