Q.

Among the compounds.

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The order of decreasing reactivity towards electrophilic substitution is

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a

II > I > III > IV

b

IV > I > II > III

c

I > II > III > IV

d

III > I > II > IV

answer is B.

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Detailed Solution

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Benzene ring with +I group is more reactive than regular benzene followed by benzene ring with -I group.

-OCH3 and -CH3 are +I groups among which, -OCH3 has high +I power than -CH3 group.

-CCl3 is a -I group.

Hence, the order of decreasing reactivity towards electrophilic substitution is: III > I > II > IV.

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