Why ChloroBenzene forms Orhto-Para product but Benzo trichloride ( C₆H₅ C Cl₃ ) forms meta product on Electrophilic Aromatic Substitution ?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane