h. For E2 elimination reaction, the base which can readily pick up a hydrogen or

Question

h. For E2 elimination reaction, the base which can readily pick up a hydrogen or donate electron to a hydrogen would be the best reagent.

Among the given choices,

NH2-

is the best base for the E2 elimination as, Nitrogen with a negative charge is highly electron rich and can most efficiently donate its electron to a hydrogen. Nitrogen being also the less electronegative atom than Oxygen is capable of donating its electron rather easily when compared to oxygen.

In E2 elimination we form a sterically hindered transition state and lower the steric hindrance of the base employed (smaller size of base), more efficient would be the base for the reaction. therefore, iPr2N- and EtO- are less effficient when compared to NH2- as base for this reaction.

Explanation / Answer

h. Best reagent for E2 eliminations NH2 CH,CH0 OH [(CH,2CHN

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