Two controversial "hard" insecticides are aldrin and dieldrin. [The Environmental Protection Agency (EPA) halted the use of these insecticides because of possible harmful side effects and because they are not biodegradable.] The commercial synthesis of aldrin began with hexachlorocyclopentadiene and norbornadiene. Dieldrin was synthesized from aldrin. Show how these syntheses might have been carried out.

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Cl CI Cl Cl Hexachlorocyclopentadiene Norbornadiene Cl Cl CI Cl Aldrin Cl Cl Cl cl Cl Dieldrin