引用第1498樓卡卡....於2009-04-07 20:32發表的“”:
4a 個ans 係咩=.........='
4b 同5a 阿sir 又講過既 [表情]
5b.i aromatic electrophilic substitution
ii. methylbenzene is activated due to the +I effect of methyl group, thus, which turn out increase the e- density of the benzene ring/ stabilise the cation intermediate for the ele. sub.->more feasible towards further sub.
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