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Class 12 Tuition > Learn Chemistry > Why Benzoic acid does not give Friedal-Crafts reaction?
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Why Benzoic acid does not give Friedal-Crafts reaction?

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Because the carboxyl group is strongly deactivating and the catalyst anhydrous aluminium chloride used in the reaction act as lewis acid and gets bonded to carboxyl group.
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Friedel Craft reaction with Benzoic acid fails because the Benzene ring is deactivated. Here electrophile is Carbocation which is a weak electrophile. So the necessity for Friedel-Craft reaction is activated Benzene ring.
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The reason behind this is carboxyl group is strongly deactivating and the catalyst anhydrous aluminium chloride used in this reaction acts as lewis acid.
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Since friedel craft catalyst is a Lewis acid (electron deficient) the catalyst (anhydrous A l C l X 3 ) reacts with electron rich COOH group of benzoic acid and gets bonded. I think Friedel Craft reaction with Benzoic acid fails because the Benzene ring is deactivated.
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