AIIMS 2018 Chemistry Basicity of Amines MCQ Question
Assertion : N,N–Diethylethanamine is more basic then N,N-Dimethylmethanamine
Reason : +I effect of ethyl is more then methyl
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
N,N-Diethylethanamine is more basic than N,N-Dimethylmethanamine due to the stronger electron-donating inductive effect of the ethyl groups compared to the methyl groups. Ethyl groups (C₂H₅) are larger and provide a greater electron density through hyperconjugation, enhancing the availability of the lone pair on the nitrogen atom for protonation. In contrast, methyl groups (CH₃) exert a weaker inductive effect, making N,N-Dimethylmethanamine less basic. The other options are not applicable as they do not provide relevant information or alternative explanations regarding the basicity of these amines.
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