He had an operation to turn him from a man into a woman (“sex-change”). Can he be alone with women?

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Check below answers in case you are looking for other related questions:
Refutation of those who excuse homosexuals on the grounds that this is the way they were created
Ruling on marrying a man who is intersex or impotent, and the difference between them

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Related Answers:
Sex-change operations
When is it permissible to do a sex-change operation from male to female or vice versa?
Why do people die of hunger if their provision has been decreed by Allaah?
Refutation of those who excuse homosexuals on the grounds that this is the way they were created
Ruling on marrying a man who is intersex or impotent, and the difference between them

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