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All aliphatic amines exhibit stronger basicity compared to ammonia. Among ethylamines, the relative strength of their basicity in a polar solvent follows the trend: secondary > tertiary > primary. Which of the following has the highest basicity?

1. (C2H5)2NH
2. (C2H5)3N
3. C2H5NH2
4. NH3

Correct answer: (C2H5)2NH

Solution

In polar solvents, secondary amines like (C2H5)2NH are the strongest bases due to optimal electron donation and solvation effects. The correct order of basicity is (C2H5)2NH > (C2H5)3N > C2H5NH2 > NH3.

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