Qualitative Analysis of Organic Compounds

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

In any ferric salt, on adding potassium ferrocyanide a Prussian blue colour is obtained, which is mainly due to the formation of

In Lassaigne's extract of organic compound both nitrogen and sulphur are present, which gives blood-red colour with ${\mathrm{Fe}}^{3+}$ due to the formation of

Match List-I with List-II.

Choose the correct answer from the options given below:

What happens when ${\mathrm{NiSO}}_4$ is heated

$\mathrm{NaOH}+\mathrm{\_\_\_\_\_}+{\mathrm{H}}_2\mathrm{S}\to {\mathrm{Na}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_5\left(\mathrm{NOS}\right)\right]$

Balance the above reaction and find the missing reactant in the given reaction?

How many compound(s) gives blood red colour with ${\mathrm{FeCl}}_3$ in Lassaigne's test?

(a) ${\mathrm{PhNH}}_2$

(b) ${\mathrm{PhSO}}_3\mathrm{H}$

(c) 

(d) $\mathrm{PhCl}$

(e) $\mathrm{PhBr}$

(f)

Prussian blue is obtained by mixing together aqueous solution of ${\mathrm{Fe}}^{3+}$ salt with

There are four test tubes containing dilute $\mathrm{HCl}, {\mathrm{BaCl}}_2, {\mathrm{CdCl}}_2$ and ${\mathrm{KNO}}_3$ solutions. Which of the following reagents will help in the identification of ${\mathrm{BaCl}}_2$?

Number of compounds which can show unsaturation test with ${\mathrm{Br}}_2/{\mathrm{H}}_2\mathrm{O}$

(a) 

(b) 

(c) 

(d) Styrene

(e) Cinnamic acid

(f) ${\mathrm{CH}}_3-{\mathrm{CH}}_3$

(g) $\mathrm{CH}\equiv \mathrm{CH}$

(h) ${\mathrm{CH}}_2={\mathrm{CH}}_2$

(i) ${\mathrm{CH}}_3-\mathrm{CH}={\mathrm{CH}}_2$

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 '$\mathrm{X}$'.

Describe the reactions involved in the detection of nitrogen in an organic compound by Lassaigne method.

Explain the method for the detection of phosphorus.

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:

Discuss in brief the principle of estimation of phosphorus.

How carbon and hydrogen are detected in an organic compounds?

What happens wwhen an organic compound is heated with $\mathrm{CuO}$?

The colour of ammonium phosphomolybdate is :