Compare the two protons H₁ and H₂ shown in the following compound and identify which proton is more acidic.

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Removing H₁ puts the negative charge on carbon : structure

Removing H₂ puts the negative charge on nitrogen : structure

Carbon and nitrogen are in the same period, so compare electronegativity : nitrogen stabilises the negative charge better. The nitrogen anion is the more stable conjugate base, so the N-H proton H₂ is more acidic.

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