Reactions of Epoxides

Question 1

Epoxide rings are opened with nucleophiles and acids HZ

Answer 1

1. The reaction occurs with a backside attack, resulting in trans or anti products
2. With nucleophile, the mechanism is SN2, and nucleophilic attack occurs at the less substituted C
3. With HZ, the mechanism is between SN1 and SN2, and attack of Z^- occurs at the more substituted C.