Which will produce highest yield in Friedel-Crafts reaction?

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Step 1: Reactivity in Friedel-Crafts Reactions
Friedel-Crafts reactions require an activated ring. Deactivated rings (especially strongly deactivated) give poor or no yield.
- (d) Aniline: lone pair on  reacts with the catalyst  to form a strongly deactivating  complex. (Poor yield).
- (a) Benzamide:  is deactivating.
- (b) Phenol: lone pair on Oxygen also complexes with .
- (c) Chlorobenzene: Chlorine is weakly deactivating, but it does not complex as strongly with  compared to  or  lone pairs.

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