Qualitative Analysis of Organic Compounds

The compound formed in the positive test for nitrogen with the Lassaigne's solution of an organic compound is

Compound $\mathrm{X}\left({\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}\right)$ gives negative tests with the following reagents.

(a) ${\mathrm{Br}}_2$ 

(b) $2,4$-Dinitrophenylhydrazine

(c) $\mathrm{Na}$ metal.

It gives two monochloro structural isomers.

Identify '$\mathrm{X}$'.

What is the colour of the ammonium phosphomolybdate precipitate which is formed during the detection of phosphorus?

For the detection of phosphorus, the organic compound after fusion with ${\mathrm{Na}}_2{\mathrm{O}}_2$ is extracted with water, boiled with ${\mathrm{HNO}}_3$ and then ammonium molybdate added to it. A yellow precipitate is obtained which is due to formation of:

The acid used in the detection of phosphorus in an organic compound is : 

In the detection of carbon and hydrogen(Qualitative analysis of organic compounds), Hydrogen is oxidised to water(tested with anhydrous copper sulphate, which turns_____).

What is the colour of the precipitate we can observe in the reaction between chloride ion with ${\mathrm{AgNO}}_3$ solution ?

In Lassaigne sodium fusion test, $\mathrm{N}$ and $\mathrm{S}$ of an organic compound are converted into $\_\_\_\_\_\_\_\_$

Detection of sulphur in Lassaigne's test is not done by which of the following reagents?

Which reagent is used for the detection of sulphur?

Which of the following is the chemical formula of ammonium phosphomolybdate ?

An organic compound on heating with $\mathrm{CuO}$ produces ${\mathrm{CO}}_2$ but not water. The organic compound may be

The Lassaigne's solution when heated with ferrous sulphate and acidified with sulphuric acid gives an intense blue colour indicating the presence of nitrogen. The blue colour is due to the formation of

Which of the following tests can be used to distinguish between methanol and ethanol.

Which of the following gives red colour in Victor Meyer's test?

The oxidation states of the iron atoms in prussain blue coloured complex formed during the test for the presence of nitrogen in an organic compound are

Sodium nitroprusside reacts with sulphide ion to give a purple colour due to the formation of

Among the following statements, select the correct statement regarding the preparation of Lassaigne's extract of a given organic compound.

The sodium extract is boiled with a few drop of nitric acid with compounds X and Y during the test of halogen by silver nitrate .Identify the compound X and Y .

During the test for halogens, when Lassaigne's extract is boiled with concentrated ${\mathrm{HNO}}_3$, it: