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Question

An organic compound whose empirical and molecular formula are same. Contains 20% carbon, 6.7% hydrogen, 46.7% nitrogen, and the rest oxygen on heating it yields ammonia, leaving a solid residue. The solid residue gives a violet colour with dilute solution of alkaline copper sulphate the organic compound is____________.

A
NH2COONH4
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B
CH3COONH4
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C
NH2NHCHO
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D
HCOONH4
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E
NH2CONH2
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Solution

The correct option is E NH2CONH2
NH2C||NH2+NHC||NH2
O O
(urea) Δ
NH2C||NHC||NH2 Biuret
O O
dil. alkaline CuSO4
Violet colour
Option E is the answer NH2CONH2 .

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