JEE Main Chemistry question

Among the halogens, the one which does NOT undergo disproportionation in basic (alkaline) solution is

(A)FluorineCorrect
(B)Chlorine
(C)Bromine
(D)Iodine

Answer: (A)

Solution

, and all disproportionate in cold dilute alkali into the halide and hypohalite ions (e.g. Cl_2+2OH^-\rightarrow Cl^-+OCl^-+H_2O), since these halogens can access positive oxidation states. Fluorine, being the

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Question ID VK-145979