8. Name these groups (left to right) 
(A) sec-propyl, sec-butyl, isobutyl
(B) isopropyl, isobutyl, sec-butyl
(C) sec-propyl, tert-butyl, isobutyl
(D) isopropyl, tert-butyl, isobutyl
(E) isopropyl, tert-butyl, sec-butyl
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統計: A(0), B(9), C(0), D(1), E(4) #1026893
統計: A(0), B(9), C(0), D(1), E(4) #1026893