Explain the regiochemical outcome for chlorination of bromobenzene. Ortho attack and para attack are preferred because each of these pathways involves a sigma complex withresonance structures. Attack at the meta position involves formation of a sigma complex with only resonance structures. The reaction will proceed more rapidly via the energy sigma complex, so attack takes place at the ortho and para positions in preference to the meta position.

See explanation

Explanation:

In a chemical reaction, a particular reaction path may be favoured due to the fact that it is energetically more favourable(lower energy sigma complex is formed).

The more the resonance structures produced in a particular reaction pathway, the more energetically favourable it is.

In the chlorination of bromobenzene, ortho attack and para attack are preferred because each of these pathways involves a sigma complex with__4________resonance structures. Attack at the meta position involves formation of a sigma complex with only____3_______ resonance structures. The reaction will proceed more rapidly via the_____lower_______ energy sigma complex, so attack takes place at the ortho and para positions in preference to the meta position.

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