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- Which one favors E2 reaction? A) isopropoxide ion B) tert-butoxide ion C) ethoxide ion D) tert-pentoxide ion please explain whyWhich SN2 reaction below is the fastest?I. Complete the following statements about mechanisms, bases, and nucleophiles. a) The SN2 mechanism reaction requires a b) The E2 mechanism reaction requires a c) A poor nucleophile makes what mechanism UNlikely? d) A weak base makes what mechanism UNlikely? e) If you determine the SN2 and E2 mechanisms are unlikely, what are you left with?