IIT-JEE 2008 · Paper 2 · Chemistry Q54

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ChemistryAssertion and reason+3 / -1Question 54 of 66

STATEMENT-1: Aniline on reaction with $\ce{NaNO2/HCl}$ 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 $\ce{NaNO2/HCl}$ at 0 °C followed by coupling with β-naphthol is due to the extended conjugation.

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is False

STATEMENT-1 is False, STATEMENT-2 is True

Answer and worked solution

Official answer: D

Statement 1. Benzenediazonium chloride couples with β-naphthol to give 1-phenylazo-2-naphthol, an orange-red dye, not dark blue. False.

Statement 2. The colour of azo dyes comes from the extended conjugation through the -N=N- bridge between the aromatic rings. True.

(D)

Topics:Diazonium salts

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IIT-JEE 2008 · Paper 2, Chemistry question 54