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प्रश्न
Write a short note on the following:
Carbylamine reaction
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
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:
C6H5NH2, C6H5N(CH3)2, (C2H5)2NH and CH3NH2
Arrange the following:
In increasing order of basic strength:
C6H5NH2, C6H5NHCH3, C6H5CH2NH2
Write the structures of the main products of the following reactions:
Write the structures of the main products of the following reactions:
The following reaction takes place in the presence of:
Arrange the following in decreasing order of their basic strength:
C6H5NH2, C2H5NH2, (C2H5)2NH2, NH3
The most reactive amine towards dilute hydrochloric acid is:
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 statement is true about methyl amine?
By the presence of a halogen atom in the ring, what is the effect of this on basic property of aniline?
What is the characteristic smell of liquid amines?
Arrange the decreasing order of pKb values.
\[\ce{C6H5NH2, C6H5NHCH3, C6H5CH2NH2, CH3NH2, NH3}\]
