An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating, it gives NH3 along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is
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CH3NCO
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CH3CONH2
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(NH2)2CO
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CH3CH2CONH2
C.
(NH2)2CO