Please help me with Part B

B. Write the mechanisms for all of the following reactions. Show curved arrows and an appropriate number of elementary steps. If a mechanimm provides stereoisomers, state the end result (e.g., racemic mixture, mixture of diastereomers, etc.) As with all reactions, be careful with your charges. B.1. B. 2 . B.3. B.4. in Nin1NaBH=