The correct structure of histidine in a strongly acidic solution $(pH = 2)$ is
A
B
C
D
JEE MAIN 2019, Difficult
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C
c The $COO^-$ group absorbs $H^+$ in acidic medium $(pH = 2)$
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Decarboxylation of all six possible forms of diaminobenzoic acids $C _{6} H _{3}\left( NH _{2}\right)_{2} COOH$ yields three products $A , B$ and $C$. Three acids give a product $'A',$ two acids gives a product $'B'$ and one acid give a product $'C'.$ The melting point of product $'C'$ is .....$^{\circ} C$.