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What is the correct order of basic strength of the following ethyl substituted amines in aqueous solution? (R=ethyl group)

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What is the correct order of basic strength of the following ethyl substituted amines in aqueous solution? (R=ethyl group)

(a) RNH2 > R2NH > R3N

(b) R2NH > R3N > RNH2

(c) R3N > R2NH > RNH2

(d) R2NH > RNH2 > R3N

I had been asked this question in an international level competition.

This interesting question is from Amines Chemical Reactions topic in division Amines of Chemistry – Class 12

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The correct choice is (b) R2NH > R3N > RNH2

The explanation is: There is a subtle interplay of inductive effect, solvation effect and stearic hinderance of alkyl groups to determine the order of basicity of alkylamines in aqueous solutions. For ethyl substituted amines, it is 2°>3°>1°

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