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Why is Friedel-Crafts acylation of benze...

Why is Friedel-Crafts acylation of benzene is favourable than that of Friedel-Crafts alkylation ?

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(ii) a. A = `CH_(3)CHO, B = C_(2)H_(6)`,
b. `C= CH_(3)C -= C CH_(3), D = CH_(3)COCH_(2)CH_(3)`,
c. `E = H_(3)C - overset(overset(Br)(|))(CH) - CH_(3)`
`F = (CH_(3))_(2) CH - CH(CH_(3))_(2)`
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