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  4. When the imidazole ring of histidine is protonated, tendency of nitrogen to be protonated (proton migrates from - COOH ) is in the order <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/53adbaf449a447ba5cffafed1c27ba31-.png />

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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 order
image

Amines

Solution:

$\gamma\left(- NH _{2}\right)$ is close to $- COOH$, in $\beta(- NH -),$ the lone pair of electrons are involved in resonance, and the lone pairs on $\alpha(- N =)$ are available.