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29. A blocking group can be used to control the outcome of an EAS? A) yield B) stereochemistry C) regiochemistry D) chemosele
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29. Option C, regiochemistry which means that at which position reaction occurs to a particular group. EWGs gives meta reaction on benzene ring while EDGs gives o/p reactions.

30. Option E, Friedal-Crafts acylation/Alkylation. Especially AlCl3 is used as Lewis acid.

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