AIIMS 2019 Chemistry Basicity of Amines MCQ Question
Correct order of basic strength is:
iii >ii > iv > i
iv > iii > ii > i
iii > ii > i > iv
iii > i > ii > iv
Correct Answer
Detailed Explanation
Option C is correct because the methyl group (−CH₃) exhibits a +I (inductive) effect, which stabilizes the positive charge on the nitrogen atom in the compound, enhancing its ability to donate a lone pair of electrons and thus increasing its basic strength. The electron-donating nature of the methyl group reduces the overall electron deficiency of the nitrogen, making it a stronger base compared to the other options.
In contrast, options A, B, and D likely contain functional groups or structural features that either do not exhibit a +I effect or have electron-withdrawing characteristics that decrease basicity, such as halogens or carbonyl groups, which destabilize the nitrogen's lone pair and reduce its basic strength.
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