1. (6 pts) Complete the following reactions by adding the missing part: either the starting compound, the necessary reagents and conditions, or the expected major product.
a)
b)
c)
2. (4 pts) Write a complete mechanism for the base-catalyzed aldol condensation of acetaldehyde in aqueous solution, including the dehydration of the aldol product. Show all steps, all resonance forms for any intermediates involved, and electron-pushing arrows.