InterviewSolution
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InterviewSolution
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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 `NH_(3)` along with a solid residue. The solid residue gives violet color with alkaline copper sulphate solution. The compounds isA. `(NH_(2))_(2)CO`B. `CH_(3)CONH_(2)`C. `CH_(3)NCO`D. `CH_(3)CH_(2)CONH_(2)` |
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Answer» Correct Answer - A Out of given organic compounds, only urea has molecular mass `= 60 u` and percentage of `% N = 46.67 %`. When gently heated, urea loses ammonia to form biuret: `(NH_(2))_(2) CO hArr NH_(3) + HNO overset((NH_(2))_(2)CO)rarrH_(2)NCONHCONH_(2)` or `H_(2)NCO-NH_(2)+H-NHCONH_(2) overset(-NH_(3))rarr underset("Biuret")(H_(2)NCONHCONH_(2))` When an aqueous biuret solution is treated with sodium hydroxide solution and a drop of copper sulphate solution, a violetcolor is produced. This is known as the biuret reaction which is characteristic of compounds containing the grouping `-CONH -`, e.g., proteins. |
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