A) \[N{{H}_{2}}CONHN{{O}_{2}}\]
B) \[N{{H}_{2}}CONHCON{{H}_{2}}\]
C) \[HCNO\]
D) \[N{{H}_{2}}CON{{H}_{2}}.HN{{O}_{3}}\]
Correct Answer: B
Solution :
Urea on slow heating gives biuret. \[{{H}_{2}}N.CONHCON{{H}_{2}}\xrightarrow{\Delta }\] \[{{H}_{2}}\underset{biuret}{\mathop{NCONH}}\,.CON{{H}_{2}}+\underset{ammonia}{\mathop{N{{H}_{3}}}}\,\]
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