NEET 2017 · ChemistryPrevious Year Question
The correct increasing order of basic strength for the following compounds is: (I) aniline, (II) p-nitroaniline, (III) p-toluidine (4-methylaniline).
Answer: (D) II < I < III. \textbf{Answer:} (d) II < I < III \textbf{Solution:} Basicity of an aniline depends on the availability of the N lone pair.
- A.II < III < I
- B.III < I < II
- C.III < II < I
- D.II < I < III✓
Correct Answer
(D) II < I < III
Solution & Explanation
\textbf{Answer:} (d) II < I < III \textbf{Solution:} Basicity of an aniline depends on the availability of the N lone pair. The group (strong /) withdraws electron density and delocalises the lone pair, sharply reducing basicity, so p-nitroaniline (II) is the weakest base. The group ( / hyperconjugation) increases electron density on N, so p-toluidine (III) is the strongest base. Order: II < I < III. Hence (d).
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