Question:
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
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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Basicity, boiling point, and solubility are influenced by factors like hydrogen bonding, alkyl group size, and resonance.
Updated On: Jan 14, 2026
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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:
\( \text{C}_6\text{H}_5\text{NH}_2<(\text{C}_2\text{H}_5)_2\text{NH}<\text{C}_2\text{H}_5\text{NH}_2 \)
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