An organic compound whose empirical and molecular formula are same, contains $20 \%$ carbon, $6.7 \%$ hydrogen, $46.7 \%$ nitrogen and the rest oxygen. On heating it yields ammonia, leaving a solid residue. The solid residue gives a violet colour with dilute solution of alkaline copper sulphate.…

Question

An organic compound whose empirical and molecular formula are same, contains $20 \%$ carbon, $6.7 \%$ hydrogen, $46.7 \%$ nitrogen and the rest oxygen. On heating it yields ammonia, leaving a solid residue. The solid residue gives a violet colour with dilute solution of alkaline copper sulphate. The organic compound is

Aicharya · Accepted Answer

\begin{array}{|c|c|c|c|c|}
\hline Element & Percentage & Atomic mass & Relative no. of atoms & Simplest ratio \\
\hline C & 20 \% & 12 & 1.66 & 1 \\
\hline H & 6.7 \% & 1 & 6.7 & 4 \\
\hline N & 46.7 \% & 14 & 3.33 & 2 \\
\hline O & 26.6 \% & 16 & 1.66 & 1 \\
\hline
\end{array}
Empirical formula $=$ Molecular formula
$=\mathrm{CH}_{4} \mathrm{~N}_{2} \mathrm{O}$ or $\mathrm{NH}_{2} \mathrm{CONH}_{2}$
$\mathrm{H}_{2} \mathrm{NCONH}_{2}+\mathrm{H}_{2} \mathrm{NCONH}_{2} \stackrel{\Delta}{\longrightarrow}$ $\mathrm{H}_{2} \mathrm{NCONHCONH}_{2}+\mathrm{NH}_{3}$
$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$biuret,
When an aqueous solution of biuret is treated with dilute sodium hydroxide and a drop of copper sulphate, a violet colour is produced. This test is known as biuret test, and is characteristic of compounds having the group $-\mathrm{CONH}-$

An organic compound whose empirical and molecular formula are same, contains $20 \%$ carbon, $6.7 \%$…

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