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Which of the following is most basic in nature?

1. NH3
2. CH3NH2
3. (CH3)2NH
4. C6H5NHCH3

Correct answer: (CH3)2NH

Solution

The basicity of amines depends on the availability of the lone pair of electrons on nitrogen. (CH3)2NH is the most basic because the electron-donating methyl groups increase electron density on nitrogen, making the lone pair more available for protonation.

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