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प्रश्न
Give a plausible explanation for the following:
Why are aliphatic amines stronger bases than aromatic amines?
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उत्तर १
Due to the −R effect of the benzene ring, the electrons on the N- atom are less available in the case of aromatic amines. Therefore, the electrons on the N-atom in aromatic amines cannot be donated easily. This explains why aliphatic amines are stronger bases than aromatic amines.
उत्तर २
Aromatic amines are far less basic than ammonia and aliphatic amines because of the following reasons:
- Due to resonance in aniline and other aromatic amines, the lone pair of electrons on the nitrogen atom gets delocalised over the benzene ring and thus it is less easily available for protonation. Therefore, aromatic amines are weaker bases than ammonia and aliphatic amines.
- Aromatic amines are more stable than corresponding protonated ions; Hence, they have very little tendency to combine with a proton to form a corresponding protonated ion, and thus they are less basic.
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संबंधित प्रश्न
Identify the weakest base amongst the following :
(a) p- methoxyaniline
(b) o-toluidine
(c) benzene - 1, 4 - diamine
(d) 4 - aminobenzoic acid
Give reasons for the following: (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
Arrange the following in increasing order of their basic strength :
C6H5 – NH2, C6H5 – CH2 – NH2, C6H5 – NH – CH3
Arrange the following in increasing order of their basic strength:
C2H5NH2, (C2H5)2NH, (C2H5)3N, C6H5NH2
Complete the following acid-base reaction and name the product:
\[\ce{CH3CH2CH2NH2 + HCl ->}\]
Complete the following reaction:
\[\ce{C6H5N2Cl + H3PO2 + H2O ->}\]
Give reason (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
Arrange the following in the increasing order of their pKb values:
C6H5NH2, C2H5NH2, C6H5NHCH3
Illustrate the following reactions giving suitable example in each case
Ammonolysis
Arrange the following in increasing order of basic strength :
C6H5NH2, C6H5NHCH3, C6H5N(CH3)2
The CORRECT decreasing order of boiling points is:
Among the following isomeric amines, an amine having highest boiling point is:
Assertion: N-Ethylbenzene sulphonamide is soluble in alkali.
Reason: Hydrogen attached to nitrogen in sulphonamide is strongly acidic.
Acetic acid exist as dimer in benzene due to
Dimerisation of carboxylic acids is due to
The hydrogen bond is shortest in
Which of the following compound gives a secondary amine oh reduction?
Which of the following amines form maximum hydrogen bonds within themselves?
