교과서 질문
Which substitution reaction takes place more rapidly?
d. CH3CH2Cl + I− or CH3CH2Br + I−
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7. Substitution Reactions
Good Leaving Groups
객관식
Which of the following correctly ranks the leaving groups from worst to best?
A
B
C
D
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검증된 단계별 안내1
Understand that the ability of a leaving group to depart depends largely on its stability once it has left, which is often related to the conjugate base's stability.
Recall that among halide ions (F⁻, Cl⁻, Br⁻, I⁻), the larger the ion, the more stable it is due to better charge distribution and lower charge density.
Recognize that the order of leaving group ability generally follows the trend: I⁻ > Br⁻ > Cl⁻ > F⁻, because iodide is the largest and most stable, while fluoride is the smallest and least stable.
Use this trend to rank the leaving groups from worst to best as: F⁻ < Cl⁻ < Br⁻ < I⁻.
Confirm that this ranking matches the correct answer given, and understand that any other order contradicts the fundamental principles of leaving group stability.
