A scarlet compound A is treated with conc. 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 ppt C. The brown ppt B on warming with conc. 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.

A scarlet compound A is treated with conc. HNO_(3) to give a chocolate

1.	A scarlet compound A is treated with conc. 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 ppt C. The brown ppt B on warming with conc. 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.
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