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प्रश्न
Write a short note on the following:
Carbylamine reaction
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उत्तर
Aliphatic and aromatic primary amines on heating with chloroform and ethanolic potassium hydroxide form isocyanides or carbylamines which are foul smelling substances. Secondary and tertiary amines do not show this reaction. This reaction is known as carbylamine reaction or isocyanide test and is used as a test for primary amines.
\[\ce{R-NH2 + CHCl3 + 3KOH ->[Heat] R-NC + 3KCl + 3H2O}\]
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संबंधित प्रश्न
Arrange the following in increasing order of their basic strength in aqueous solution:
\[\ce{CH3NH2, (CH3)3N, (CH3)2NH}\]
Write the structures of main products when aniline reacts with the following reagents : HCl
Arrange the following:
In decreasing order of the pKb values:
C2H5NH2, C6H5NHCH3, (C2H5)2NH and C6H5NH2
Arrange the following:
In increasing order of basic strength:
Aniline, p-nitroaniline and p-toluidine
Write the structures of the main products of the following reactions:
Write the structures of the main products of the following reactions:
Explain why \[\ce{MeNH2}\] is stronger base than \[\ce{MeOH}\]?
Account for the following:
Acylation of aniline is carried out in the presence of pyridine.
When methyl iodide is heated with ammonia, what is the product obtained?
A Solution of methyl amine shows which type of property with litmus paper?
Which of the following is most basic?
By the presence of a halogen atom in the ring, what is the effect of this on basic property of aniline?
What is the correct decreasing order of the basic character of the three amines and ammonia?
Give reasons for the following observation:
pKb of aniline is lower than the m-nitroaniline.
Account for the following:
Arrange the following compounds in the increasing order of their basic strength in aqueous solution: CH3NH2,(CH3)3N,(CH3)2NH
Which of the following compound cannot be produced if 1-propane amine is treated with NaNO2 and HCl?
Arrange the decreasing order of pKb values.
\[\ce{C6H5NH2, C6H5NHCH3, C6H5CH2NH2, CH3NH2, NH3}\]
The correct order of the increasing basic nature of Ammonia, Methylamine and Aniline is:
