Anhydrous aluminium chlorideis used as a catalyst.

1.	Anhydrous aluminium chlorideis used as a catalyst.
Answer» Solution :The Alatom in `AlCl_(3)`,has only6 electronsin itsvalenceshell.It NEEDS two more electronsto complete its octet. It,therefore,acts as a LEWIS andcatalystin Friedel-Crafts alkylationand acylation reactionof benzeneand other aromatic compounds . In these reaction, it helpsto generatethe electrophile (`R^(+)` from`R-Cl`or `RCO^(+)`from `RCOCl` or `(RCO)_(2)O)` which thenthen attacksthe benzee/aromaticring.

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