what is element effect in E2 mechanism?

Asked by gnikhilvarma | 31st May, 2009, 06:27: PM

Expert Answer:

E2 mechanism is second order elimination reaction.

Element effect means that if element is changed in the reactant, the rate of reaction will change.

For example: with ethoxide ion, the rate of reaction of 2-phenyl ethyl halides is as follows:

C6H5CH2CH2I > C6H5CH2CH2Br > C6H5CH2CH2Cl > C6H5CH2CH2F

This is because the transition state involves the cleavage of carbon halogen bond.

Since carbon iodide bond is the weakest, the rate of reaction for C6H5CH2CH2I will be the highest.

Answered by  | 1st Jul, 2009, 09:34: AM

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