Rank the following groups in order of increasing activating power in electrophilic aromatic substitution reactions:
-OCH3, -OCOCH2CH3, -CH2CH3, -Br.
a) -OCH3 ‹ -OCOCH2CH3 ‹ -CH2CH3 ‹ -Br.
b) -Br ‹ -OCOCH2CH3 ‹ -CH2CH3 ‹ -OCH3
c) -OCOCH2CH3 ‹ -Br ‹ -OCH3 ‹ -CH2CH3
d) -Br ‹ -CH2CH3 ‹ -OCOCH2CH3 ‹ -OCH3
e) -OCOCH2CH3 ‹ -OCH3 ‹ -Br ‹ -CH2CH3
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