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Q.

(A) Aniline on reaction with NaNO2/HCl at 0oC followed by coupling with β-naphthol gives a red colored precipitate.
(R) The colour of the compound formed in the reaction of aniline with NaNO2/HCl at 0oC followed by coupling with β-napthol is due to the extended conjugation.

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a

Both (A) and (R) are true but (R) is not the correct explanation of (A)

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is A.

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Detailed Solution

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Benzene diazonium chloride on coupling with β-naphthol gives red colour dye. Colour of ye is because of extended conjugation in the dye.

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