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  4. Among the following compounds the decreasing order of reactivity towards electrophilic substitution is

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Q. Among the following compounds the decreasing order of reactivity towards electrophilic substitution isChemistry Question Image

AIPMTAIPMT 2000Hydrocarbons

Solution:

In $-CH_3, -OCH_3$ and $ CF_3, CH_3 $ and $-OCH_3$ are electron donating group. Hence, they activate the benzene nucleus. In these, order of activation is $-OCH_3 > -CH_3 $ while $ -CF_3$ group deactivates the benzene nucleus. So, it shows lower rate of electrophilic substitution on benzene ring. Thus, order of electrophilic substitution is

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