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Match each nucleophilic substitution mechanism with its kinetic hallmark:

A1-A, 2-B, 3-C
B1-B, 2-A, 3-C
C1-C, 2-B, 3-A
D1-A, 2-C, 3-B
Answer & Solution
Correct answer: A. 1-A, 2-B, 3-C
SN1 is 2 steps via carbocation. SN2 is 1 step with Walden inversion. SN2 reactivity favors 1°.
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