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Question

In which of the following, nitration will take place at m - position?
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A
I only
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B
II, III & IV
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C
I, III & IV
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D
I, II & III
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Solution

The correct option is D I only

The activating group directs the reaction to the ortho or para position, which means the electrophile substitute the hydrogen that is on carbon 2 or carbon 4.
The deactivating group directs the reaction to the meta position, which means the electrophile substitute the hydrogen that is on carbon 3 with the exception of the halogens that is a deactivating group but directs the ortho or para substitution.

CCl3 is a strong deactivating group so it is a meta director.

Cl is ortho- para- directing groups but unlike most ortho- para- directors, Cl tend to deactivate benzene.(unusual property).


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