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Aniline is heated with K(2)Cr(2)O(7) and...

Aniline is heated with `K_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)`. The product is

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When a white crystalline compound 'X' is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) a red dish brown gas 'A' is evolved. On passing 'A' into caustic soda solution, a yellow coloured solution of 'B' is obtained. Neutralising the solution 'B' with acetic acid and on subsequent addition of lead acetate a yellow precipitate C is obtained. When 'X' is heated with NaOH a colourless gas is evolved and on passing this a gas into K_(2)HgI_(4) (Nessler's reagent) solution a reddish brown precipitate D is formed. Identify '(A), (B), (C), (D) and X. Write equations for the reactions involved.

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Compound 'X' (C_(3)H_(8)O) is treated with acidified K_(2)Cr_(2)O_(7) to form product 'Y' (C_(3)H_(6)O) 'Y' does not form silver mirror with ammoniacal AgNO_(3) but when treated with semicarbazide in feebly acidic medium gives:

An organic compound X on treatment with K_(2)Cr_(2)O_(7) in anhydrous medium gives a compound Y which reacts with I_(2) and sodium carbonate to form triiodomethane. The compound X is