A scarlet compound A is treated with cone. HNO_3 to give a chocolate brown precipitate B. The precipitate is filter

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Q 2617356280.     A scarlet compound A is treated with cone. HNO_3 to give a chocolate brown precipitate B. The precipitate is filtered and the filtrate is neutralised with NaOH. Addition of KI to the resulting solution gives a yellow ppl C. The brown ppt B on warming with cone. HNO_3 in the presence of Mn(NO_3)_2 produces a pink coloured solution due to the formation of D. Identify A. B, C and D. Write the reaction sequence.
JEE 1995

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