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An organic compound whose empirical and ...

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

A

`NH_(2)COONH_(4)`

B

`CH_(3)COONH_(4)`

C

`NH_(2)NHCHO`

D

`HCOONH_(4)`

Text Solution

Verified by Experts

The correct Answer is:
D

Empirical formula = Molecular formula = `CH_(4)N_(2)O` or `NH_(2)CONH_(2)`
`H_(2)NCONH_(2) + H_(2)NCONH_(2) overset(Delta) to H_(2)NCOunderset("Biuret")(NH)CONH_(2) + NH_(3)`
`underset("Biuret")("Urea Biuret") overset("alk."CuSO_(4)) to underset(" Violet colour")("Urea")`
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, is characteristic of compounds having the group -CONH
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