please answer both wuestions 3&4.

4. Provide a retrosynthesis for the following multistep syntheses (you may use any other reagents needed). Also, provide a synthesis in the forward direction. a b) 3. Show how you would synthesize each of the following molecules from an alkene of appropriate structure (Hint: pay close attention to what functional groups you have in the molecule and work backwards). a) b) c) d)