In each of $α$ $β$ and $γ$ $is a positive acute angle such that$
$sin (α + β - γ) = \frac{1}{2}, cos (β + γ - α) = \frac{1}{2} and tan (γ + α - β) = 1$
Find the values of $α$ , $β$ , & $γ$ .

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When the imidazole ring of Histidine is protonated, tendency of nitrogen to be protonated (proton migrates from −COOH) is in the order?

The correct option is C γ > α > βγ(−NH2) is close to -COOH, in β(−NH−), the lone pair of electrons is involved in resonance, and the lone pair on α(−N=) is intact on N−atom.The order is : γ > α > β

When the imidazole ring of Histidine is protonated, tendency of nitrogen to be protonated (proton migrates from $- C O O H$ ) is in the order?

The correct option is C $γ$ > $α$ > $β$
$γ (- N H_{2})$ is close to -COOH, in $β (- N H -)$ , the lone pair of electrons is involved in resonance, and the lone pair on $α (- N =)$ is intact on $N -$ atom.
The order is :
γ > α > β