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Among arylamines, alkylamines, and ammonia, the order of basic strength is:

1. Dimethylamine > Methylamine > Trimethylamine > Aniline
2. Trimethylamine > Methylamine > Dimethylamine > Aniline
3. Aniline > Methylamine > Dimethylamine > Trimethylamine
4. Dimethylamine > Trimethylamine > Methylamine > Aniline

Correct answer: Dimethylamine > Methylamine > Trimethylamine > Aniline

Solution

In aqueous solution, basic strength reflects a balance of inductive and solvation effects: dimethylamine > methylamine > trimethylamine > aniline. Aniline is weakest due to lone-pair delocalization into the ring. The stored order placing trimethylamine above methylamine is incorrect; the correct order is option 0.

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