1. Draw (2R,3R)-3-bromo-2-butanol, (2S,3S)-3-bromo-2-butanol, (2R,3S)-3-bromo-2-butanol, and (2S,3R)-3-bromo-2-butanol. Convert these pictures to Fischer projections. 2. Show the movement of electrons using arrow pushing for the following reaction. 3. Define a nucleophile and an electrophile. You'll have to read your textbook for this one. List a few examples of nucleophiles and electrophiles. In the reaction above, identify nucleophiles, and electrophiles for all steps