Question

In rxn Benzotrichloride with Br2/Fe why we get Br at meta position?? as it should have at ortho and para position​

Answer 1

Answer:

The exact influence of a given substituent is seen as its interactions with the delocalized positive charge on the benzonium intermediate generated by bonding to the electrophile at each of the three substitution sites. Nitro groups have a positive charge on the atom bonded to the aromatic ring. Like charges of two groups are destabilized by charge repulsion so meta-products predominate as compared to others.

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