MCQ
Among the following amines, which one has the highest pKb value in aqueous solution?
- AMethanamine
- BN, N - dimethylaniline
- CEthanamine
- DBenzenamine
✓
Answer
- Benzenamine
Explanation:
+Inductive effct increases the electron density on nitrogen thus makes it more basic while +R effect involves the lone pair of N in conjugation thereby reduces its basicity.
Therefore aniline are less basic than alkyl amines and secondary aniline are more basic than aniline.
Highest pKb means least basic nature
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