按 S N 2 历程,化合物 a.CH 3 CH 2 CH 2 Br 、 b. (CH 3 ) 2 CHBr 、 c.(CH 3 ) 3 CBr 的反应活性是 :
A.
a > b > c
B.
b > c > a
C.
c > a > b
D.
c > b > a
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