Aniline gets coloured on standing in air for a long time . why?
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Answer:
Explanation:
Aniline gets coloured on standing in air for a long time. The electron density on aniline increases due to + R effect of -NH2 group and due to high electron density aniline gets readily oxidized in air to give colour products.
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Due to electron donating effect ( +R effect) of NH2 group the electron density on benzene ring increases. As a result aniline is easily oxidiser on standing in air for a long time to form colored products.
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