Doubt from alocohols and epoxides

#1

Capture

why did OH- ions attack carbonyl group adjacent to sulphur first rather than attack carbonyl group besides oxygen?
electronegativity of oxygen is greater than Sulphur so carbon besides oxygen will have greater positive charge and hence OH- should attack him.

#2

Yeah you have written correct carbon beside oxygen will have more positive charge as both oxygen will take electron from carbon.

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