Fewpal
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Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene. 

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The ethylation reaction of benzene involves the addition of an ethyl group on the benzene ring. Such a reaction is called a Friedel-Craft alkylation reaction. This reaction takes place in the presence of a Lewis acid. Any Lewis acid like anhydrous FeCl3, SnCl4, BF3 etc. can be used during the ethylation of benzene. 

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