MCQ
When ammonium cyanate is heated for a long time, the product is:
- ANitrous oxide
- BAmmonium cyanide
- CNitrogen and water
- ✓Biuret
✓
Answer
Correct option: D.
Biuret
When ammonium cyanate is heated urea is first formed
$\text{NH}_4\text{CNO}\ \ \ \ \ \ \ \xrightarrow{\text{Heat}}\text{NH}_2\text{CONH}_2\\^\text{Ammonium Cyanate}\ \ \ \ \ \ \ \ \ \ ^\text{urea}$
Urea on further heating gives biuret
$\text{NH}_2\text{CONH}_2\xrightarrow{\text{Heat}}\text{NH}_2\text{CONHCONH}_2+\text{NH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Biuret}$
$\text{NH}_4\text{CNO}\ \ \ \ \ \ \ \xrightarrow{\text{Heat}}\text{NH}_2\text{CONH}_2\\^\text{Ammonium Cyanate}\ \ \ \ \ \ \ \ \ \ ^\text{urea}$
Urea on further heating gives biuret
$\text{NH}_2\text{CONH}_2\xrightarrow{\text{Heat}}\text{NH}_2\text{CONHCONH}_2+\text{NH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Biuret}$
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