4. Consider the following compounds. (a) Which of the compounds A-E cannot be easily oxidized? (b) Draw the structures of the common oxidation products for A-E, not listed under a. (c) Which of the compounds A-E cannot be reduced? (d) Draw the structures of the common reduction products for A-E not listed under c. (e) Determine the oxidation number for all atoms connected to 0 in compound D. 5. Sort the following carbonyl compounds according to decreasing carbonyl reactivity