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Assertion (A): Aryl amine becomes coloured on long standing.
Reason (R): Aryl amine can undergo atmospheric oxidation on long standing.

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(A) is true but (R) is false

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

Both (A) and (R) are false

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

answer is A.

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Detailed Solution

The electron density of aryl amine increases due to $+ M$ effect of $- {NH}_{2}$ group. As a result it gets readily oxidised by air and forms a coloured compound.

That's why Aryl amine becomes coloured on long standing.

Thus, both assertion and reason are true and reason is the correct explanation of assertion

Hence, option (A) is correct.

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