The equivalent weight of Baeyer's reagent is

Formula of Baeyer's reagent is ${\mathrm{KMnO}}_4$.

Equivalent weight is the ratio of Molecular mass to ‘n’ factor.

Change in oxidation on the state of ${\mathrm{KMnO}}_4$ in basic medium = 3.

Molecular weight of ${\mathrm{KMnO}}_4=158$.

Equivalent weight $=158/3=52.66$.