Question

Aniline and diphenylamine may be distinguished by:
A. lassaigne test
B. schiff test
C. carbylamine reaction
D. solubility test

Answer 1

Hint:Aniline is termed as primary amine and diphenylamine is termed as secondary amine.Carbylamine reaction mechanism involves the treating of amine to the intermediate produced from the dehydrohalogenation of chloroform. This intermediate is known as dichlorocarbene. The carbylamine reaction is also called Hofmann isocyanide synthesis.

Complete Answer:
 Aniline and diphenylamine have a chance to be distinguished by carbylamine reaction.
Aniline is termed as primary amine and diphenylamine is termed as secondary amine.
The carbylamine reaction is known by primary amines. It cannot be given by secondary or tertiary amines.
In Hoffmann's carbylamine test which is also known as isocyanide test. Aliphatic or aromatic primary amine is usually heated with chloroform in the presence of alcoholic potassium hydroxide which forms foul smelling alkyl/aryl isocyanide or carbylamine.
${C_6}{H_5} - N{H_2} + CHC{l_3} + 3KOH \to {C_6}{H_5} - NC + 3KCl + 3{H_2}O$

Hence, Option C is correct.

Additional Information:
Lassaigne test is a test for the detection of halogens, nitrogen and sulphur in an organic compound. The ionic compounds produced during the fusion are extracted in aq. solution and it can be detected by normal chemical tests. The extract is termed as sodium fusion extract or Lassaigne's extract.
The Schiff test is a chemical test which is used to examine for the existence of aldehydes in a given analyte. This can be formed by reacting the analyte along with a small quantity of a Schiff reagent.

Note: carbylamine reaction is known by primary amines and aniline is termed as primary amine and diphenylamine is termed as secondary amine. So there is a quite clear idea about the answer.he solubility test procedure is formed by trying to dissolve chemicals in many different solvents with increasingly rigorous mechanical techniques. The solvents which are to be used, in the order of priorities, are cell culture media, DMSO, and ethanol. Solubility shall be calculated in a stepwise procedure that includes trying to dissolve a test chemical in the solvents.