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प्रश्न
Arrange the following in increasing order of their basic strength:
CH3NH2, (CH3)2NH, (CH3)3N, C6H5NH2, C6H5CH2NH2
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उत्तर
Considering the inductive effect and the steric hindrance of alkyl groups, CH3NH2, (CH3)2NH, and (CH3)3N can be arranged in the increasing order of their basic strengths as:
(CH3)3N < CH3NH2 < (CH3)2NH
In C6H5NH2, N is directly attached to the benzene ring. Thus, the lone pair of electrons on the N-atom is delocalized over the benzene ring. In C6H5CH2NH2, N is not directly attached to the benzene ring. Thus, its lone pair is not delocalized over the benzene ring. Therefore, the electrons on the N atom are more easily available for protonation in C6H5CH2NH2 than in C6H5NH2 i.e., C6H5CH2NH2 is more basic than C6H5NH2.
Again, due to the −I effect of C6H5 group, the electron density on the N-atom in C6H5CH2NH2 is lower than that on the N-atom in (CH3)3N. Therefore, (CH3)3N is more basic than C6H5CH2NH2. Thus, the given compounds can be arranged in the increasing order of their basic strengths as follows:
C6H5NH2 < C6H5CH2NH2 < (CH3)3N < CH3NH2 < (CH3)2NH
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संबंधित प्रश्न
Give reasons for the following: (CH3)2NH is more basic than (CH3)3N in an aqueous solution.
Give reason for the following:
Primary amines have higher boiling point than tertiary amines.
How will you convert Benzene into N, N-dimethylaniline?
How will you convert Cl−(CH2)4−Cl into hexan-1, 6-diamine?
Account for the following:
Gabriel phthalimide synthesis is preferred for synthesising primary amines.
Accomplish the following conversion:
Benzene to m-bromophenol
Complete the following reaction:
\[\ce{C6H5N2Cl + H3PO2 + H2O ->}\]
Arrange the following in the increasing order of their pKb values:
C6H5NH2, C2H5NH2, C6H5NHCH3
Choose the most correct option.
Which one of the following compounds has the highest boiling point?
Tertiary amines have lowest boiling points because ________________
Account for the following:
N-ethylethanamine boils at 329.3 K and butanamine boils at 350.8 K, although both are isomeric in nature.
Which of the following have less melting point than amine?
Which of the following amines form maximum hydrogen bonds within themselves?
Arrange the following in increasing order of their boiling point:
C2H5OH, C2H5NH2, (C2H5)3N
Arrange the decreasing boiling point.
\[\ce{CH3COOH, C2H5OH, CH3NH2, CH3OCH3}\]
Write short note on the following:
Ammonolysis
The correct order of decreasing basic strength of the given amines is:
