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Question 47

Ceric ammonium nitrate and $$CHCl_3$$ / alc. KOH are used for the identification of functional groups present in ______ and ______ respectively.

Ceric ammonium nitrate (CAN) test is used to identify alcohols. When an alcohol is added to a solution of ceric ammonium nitrate, the yellow solution turns red due to the formation of a cerium(IV) alkoxide complex. This confirms the presence of the $$-OH$$ group in alcohols.

The $$CHCl_3$$ / alcoholic KOH test is known as the carbylamine (isocyanide) test. When a primary amine is heated with chloroform and alcoholic KOH, it produces an isocyanide (carbylamine) with an extremely foul smell. The reaction is:

$$R-NH_2 + CHCl_3 + 3KOH \rightarrow R-NC + 3KCl + 3H_2O$$

This test is specific to primary amines only.

Therefore, ceric ammonium nitrate is used for alcohol identification and $$CHCl_3$$ / alc. KOH is used for amine identification. The correct answer is alcohol, amine.

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