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Which of the following compounds is most basic?

1. O2N—NH2
2. CH2NH2
3. N—COCH3
4. NH2

Correct answer: CH2NH2

Solution

CH2NH2 is the most basic because the amino group (-NH2) is attached to a methyl group, which slightly increases electron density on nitrogen, enhancing its basicity. Other options have electron-withdrawing groups or resonance effects that reduce basicity.

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