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____________.

• A. $N{H}_{2}COON{H}_4$
• B. $C{H}_{3}COON{H}_4$
• C. $N{H}_{2}NHCHO$
• D. $HCOON{H}_4$
• E. $N{H}_{2}CON{H}_2$

Answer 1

The correct option is E $N{H}_{2}CON{H}_2$

$N{H}_2-\underset{||}{C}-N{H}_2+NH-\underset{||}{C}-N{H}_2$

$O$ $O$

(urea) $\downarrow \Delta$

$N{H}_2-\underset{||}{C}-NH-\underset{||}{C}-N{H}_2$ Biuret

$O$ $O$

$\downarrow$ dil. alkaline $CuS{O}_4$

Violet colour

Option E is the answer $N{H}_{2}CON{H}_2$ .