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7. Substitution Reactions

7. Substitution Reactions / Good Leaving Groups / Problem 5

Which of the following structures has a better leaving group? Justify your answer.

A

Structure (b) has a better leaving group because the loss of the leaving group forms a weaker (more stable) base that is neutral.

B

Structure (b) has a better leaving group because the loss of the leaving group forms a stronger (more stable) base that is charged.

C

The leaving groups of both structures have the same leaving group ability because of the presence of the oxygen atom.

D

None of these.

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