JEE Advanced 2008 Chemistry question

STATEMENT-1 : Aniline on reaction with at 0 °C followed by coupling with β-naphthol gives a dark blue coloured precipitate. and STATEMENT-2 : The colour of the compound formed in the reaction of aniline with at 0 °C followed by coupling with β-naphthol is due to the extended conjugation.

(A)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
(B)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
(C)STATEMENT-1 is True, STATEMENT-2 is False
(D)STATEMENT-1 is False, STATEMENT-2 is TrueCorrect

Answer: (D)

Solution

Aniline is diazotised to benzenediazonium chloride, which couples with β-naphthol in alkaline medium to give 1-phenylazo-2-naphthol, an orange-red (scarlet) dye — not dark

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Question ID VK-037658