Arrange the following compounds as asked:
(a) In decreasing order of pKb values
C2H5NH2, (C2H5)2NH, C6H5NHCH3, C6H5NH2
(b) In increasing order of boiling point
C2H5OH, C2H5NH2, (CH3)2NH
(c) In increasing order of solubility in water
C6H5NH2, (C2H5)2NH, C2H5NH2
(a) In decreasing order of pKb values
C2H5NH2, (C2H5)2NH, C6H5NHCH3, C6H5NH2
(b) In increasing order of boiling point
C2H5OH, C2H5NH2, (CH3)2NH
(c) In increasing order of solubility in water
C6H5NH2, (C2H5)2NH, C2H5NH2
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Solution and Explanation
(a) Decreasing order of pKb values (i.e., increasing basicity):
\( (\text{C}_2\text{H}_5)_2\text{NH}>\text{C}_2\text{H}_5\text{NH}_2>\text{C}_6\text{H}_5\text{NHCH}_3>\text{C}_6\text{H}_5\text{NH}_2 \)
(b) Increasing order of boiling point:
\( (\text{CH}_3)_2\text{NH}<\text{C}_2\text{H}_5\text{NH}_2<\text{C}_2\text{H}_5\text{OH} \)
(c) Increasing order of solubility in water:
\( \text{C}_6\text{H}_5\text{NH}_2<(\text{C}_2\text{H}_5)_2\text{NH}<\text{C}_2\text{H}_5\text{NH}_2 \)
Top Questions on Amines
- Assertion (A): Boiling point of (C6H5)2NH is lower than that of n-C4H9NH2. Reason (R): Hydrogen bonding is much more extensive in (C6H5)2NH as compared to n- C4H9NH2.
- Arrange the following compounds as asked:
(a) In decreasing order of pKb, values: C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NHCH$_2$CH$_3$, C$_6$H$_5$NH$_3$
(b) Increasing order of boiling point: C$_6$H$_5$OH, C$_2$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NH$_2$
(c) Increasing order of solubility in water: C$_6$H$_5$NH$_2$, (C$_2$H$_5$)$_2$NH, C$_6$H$_5$NHCH$_2$CH$_3$ - Assertion (A): Acetanilide is less basic than aniline.
Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen. - Hoffmann Bromamide degradation reaction is given by:
- Why ammonolysis of alkyl halides is not a good method to prepare pure amines?
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- Solutions
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