Question

what do you mean by anhydrated AlCl# in friedel-craft acylation reaction

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Answer 1

Anhydrous is a term that is used to denote something that is free from water. Therefore anhydrous AlCl₃ means aluminium chloride that is free from water. Anhydrous AlCl₃ acts as a lewis acid, thus it can accept electron to form intermediates and speed up the reaction. Hence it is used as a catalyst in reactions such as friedal craft alkylation, friedal craft acylation etc.