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प्रश्न
Amongst the following, the strongest base in aqueous medium is ______.
पर्याय
\[\ce{CH3NH2}\]
\[\ce{NCCH2NH2}\]
\[\ce{(CH3)2NH}\]
\[\ce{C6H5NHCH3}\]
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उत्तर
Amongst the following, the strongest base in aqueous medium is \[\ce{(CH3)2NH}\].
Explanation:
2° amine is more basic than 1° amine, i.e., \[\ce{(CH3)2NH}\] is more basic than \[\ce{CH3NH2}\]. Due to \[\ce{^-I}\] effect of \[\ce{CN}\] group, \[\ce{NC-CH2NH2}\] is less basic than \[\ce{CH3NH2}\]. Further \[\ce{C6H5NHCH3}\] is less basic than both \[\ce{CH3NH2}\] and \[\ce{(CH3)2NH}\] due to delocalization of lone pair of electrons present on the nitrogen atom into benzene ring. Hence, the decreasing order of amines is:
\[\ce{(CH3)2NH > CH3NH2 > C6H5NHCH3 > NC – CH2NH2}\]
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संबंधित प्रश्न
An aromatic compound 'A' of molecular formula C7H7ON undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions :
Accomplish the following conversion:
Nitrobenzene to benzoic acid
Write the reaction of aromatic primary amine with nitrous acid.
Arrange the following in the increasing order of their pKb values:
C6H5NH2, C2H5NH2, C6H5NHCH3
Account for the following:
Gabriel phthalimide synthesis is not preferred for preparing aromatic primary amines.
Identify the product 'A' in the following reaction.
\[\ce{Aniline ->[(CH3CO)2O][Pyridine] A}\]
Identify the product obtained when benzyl chloride undergoes ammonolysis in presence of excess ammonia followed by the reaction with two moles of methyl iodide.
Identify the INCORRECT statement regarding Hofmann bromamide reaction.
Quaternary ammonium salt is formed:
The source of nitrogen in Gabriel synthesis of amines is ______.
Hoffmann Bromamide Degradation reaction is shown by ______.
Which of the following amines can be prepared by Gabriel synthesis.
(i) Isobutyl amine
(ii) 2-Phenylethylamine
(iii) N-methylbenzylamine
(iv) Aniline
Write following conversions:
nitrobenzene `->` acetanilide
Which of the following reactions will not give a primary amine?
When primary amines are treated with HCl, the product obtained is which of the following?
Which of the following reaction DOES NOT involve Hoffmann bromamide degradation?
Which of the following amines can be prepared by Gabriel phthalimide reaction?
Write the name of the product formed by the action of LiAlH4/ether on acetamide.
Write the name of reduction product formed when ethyl cyanide is treated with sodium and alcohol.
