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Why is halogenation the fastest one?

Why is friedel crafts reactions the slowest? And why is it so slow that it can not undergo meta substitution electrophilic reactions?

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Why some aromatic additions happens fast and some happens slow
Hi, halogenation of benzene happens fast while alkylation happens slow. Why is it so? The question is described in the attachment please go there for the whole question. Thanks!

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There are two reasons for this:

(1) Oriention and Reactivity of Substituent Group

Halogenation of anisole is the fastest electrophilic substation reaction, whereas Friedel-Crafts reaction is the slowest one. This is because -OR group (e.g. -OCH3 here) is an activating substituent ...

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Tania Dey, PhD
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