Question 32 Which of the following insecticides is formed by Diels Alder reactio

Question

Question 32

Which of the following insecticides is formed by Diels Alder reaction of hexachlorocyclopentadiene and how do you know that Briefly explain why there is such a vast number of insecticides ... 20 words can easily be enough. Pyrethrin insecticides are said to be "natural" type insecticides. Why? What structural feature is found in synthetic pyrethroids, like permethrin ..? What is the class of pesticides that is causing some much trouble for bees? How did Cousteau and friends probably get exposed to PCBs? How did Gavin get exposed, probably, to PBDEs? How do Orcas get exposed to PCBs ad PBDEs? Draw an example of a PCB congener and an example of a PBDE congener.

Explanation / Answer

31. Of the given structures,

the first one on the left is formed from hexachlorocyclopentadiene by a diels alder reaction. The number of Cl in the structure matches with the starting material.

32. The number of species of insects we deal with are huge and thus the number insecticides to fight them are also vast number.

33. Pyrethrin is derrived from a natural occuring plant and is thus termed as natural insecticide. It acts an a insect repellant. The three memebred cyclopropane ring attached to vicinal dihalide is the key feature in the structure.

34. Nionicotinoids are class of insecticides which are harmful for bees.

35. Causteaw and friends got exposed to PCB's through garage.

36. Gavin get exposed to PBDE's on construction site.

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