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Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as:
Biuret test is not given by:
The Biuret test is a chemical test used to detect the presence of peptide bonds in proteins and polypeptides. It involves treating the sample with a copper(II) salt solution and observing a violet or pink color change. Carbohydrates do not contain peptide bonds, so they do not give a positive Biuret test.
An aromatic amine (A) was treated with alcoholic potash and another compound (Y) when a foul smelling gas was formed with formula C6H5NC. (Y) was formed by reacting a compound (Z) with Cl2 in the presence of slaked lime. Compound (Z) is:
(Y) is CHCl3; (Y) is formed from (Z) + Cl2 + Ca(OH)2 and thus (Z) is CH3COCH3.
Aniline was acetylated. The product on nitration followed by alkaline hydrolysis gave:
Aniline, when acetylated, forms acetanilide. Nitration of acetanilide gives a mixture of o-nitroacetanilide and p-nitroacetanilide. Alkaline hydrolysis of these compounds removes the acetyl group, giving a mixture of o-nitroaniline and p-nitroaniline.
Pyridine possesses :
Pyridine is an aromatic heterocyclic compound consisting of a six-membered ring with five carbon atoms and one nitrogen atom. The presence of the delocalized π-electron system in the ring gives pyridine its aromatic nature, similar to benzene.
Ammoniacal solution of Ni(CN)2 reacts with C6H6 to produce a light violet coloured crystaline compound of the formula:
The reaction, is called:
(b) Replacement of N2Cl by halogen atom of CuX-HX from benzene diazonium chloride is called Sandmeyer's reaction.
When nitrobenzene is treated with Br2 in presence of FeBr3, the major product formed is m-bromonitrobenzene. Statements which are related to obtain the m-isomer are:
(a) The presence of m-directing groups in benzene nucleus simply decreases electron density at o- and p-, whereas no change in electron density at m-position is noticed.
The presence of N radical in solution can be detected by:
+7KI + K+ + 3H2O.
Potassium thiocyanate solution reacts with ferric chloride to give:
When potassium thiocyanate (KSCN) solution reacts with ferric chloride (FeCl3), it forms a blood-red colored complex ion called the thiocyanate ion [Fe(SCN)]2+. This reaction is used as a test for Fe3+ ions and is known as the Prussian blue test.
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