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Q. When the imidazole ring of Histidine is protonated, tendency of nitrogen to be protonated (proton migrates from $- COOH$) is in the orderChemistry Question Image

Amines

Solution:

$\gamma (NH_2)$ In close to $COOH$, in $\beta(-NH_2)$, the lone pair of electrons Is involved in resonance, nod flie lone pair on $\alpha(- N=)$ is intact on $N$- atom.