Question

An organic compound $X$ 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 ammonia along with a solid residue. The solid residue gives violet colour with alkaline copper sulphate solution. The compound $X$ is:

• A. $C{H}_{3}C{H}_{2}CON{H}_2$
• B. $C{H}_{3}NCO$
• C. $C{H}_{3}CON{H}_2$
• D. $(N{H}_2{)}_{2}CO$

Answer 1

The correct option is D $(N{H}_2{)}_{2}CO$

In the given compounds, only urea ($N{H}_2{)}_{2}CO$ has nitrogen $46.67$%. Urea on heating gives a solid biuret residue which gives violet colour with alkaline $CuS{O}_4$.

Hence, option $A$ is correct.