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Question

Rank in order of increasing rate of reaction towards EAS with bromine in the presence of FeBr3.
993459_23ef5aeaf8304f8c9dda8dce05a954af.jpg

A
B<A<C
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B
B<C<A
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C
A<B<C
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D
A<C<B
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Solution

The correct option is A B<A<C
For bromination on benzene ring or for electrophilic aromatic substitution, an electron donating group should be attached to the ring.
In case of C (Refer to Image 1)
Oxygen donate its electron to the ring and make it more activation.
Only electron donating group attached.
In case of A (Refer to Image 2)
Both electron donating and electron withdrawing group are present which make the ring less activating than C.
In case of B (Refer to Image 3)
As only electron withdrawing group is attached to the ring which makes the ring more deactivating towards Electrophilic substitution.
Thus the order for EAS is C>A>B .

1115859_993459_ans_39989bfa012745588c56d021bf6fd1e6.png

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