3. Mechanisms. Draw curved arrow mechanisms. Some questions have additional instructions,please read carefully (21 points, 7 each) a) Draw a mechanism that does not open the ring. Hydronium (shown) is

a catalyst. b) Draw a curved arrow mechanism for the formation of the amide (lactam) below (5 pts). Only one diastereomer of the starting material reacts. Draw or state which stereoisomer it is (2 pts). c) A chemist proposed the reaction below. Draw a mechanism to rationalize how this product could form via an epoxide intermediate. Your mechanism should describe the stereochemicaloutcome,