My destroyer book classifies OH as an Ortho/Para director which activates the ring. The only O/P directors which deactivate an aromatic ring is NO and halogens.
Destroyer seems correct to me, don't know which problems you're referring to but solution to #13 clearly shows that Destroyer classifies OH as an O/P Activator.
THe only thing you have to memorize is that halogens are o/p directing deactivators. The rest you can think it through logically. Example:
NO2- The nitrogen is bonded to the benzene ring. The O is more electronegative than N so it has the - charge giving N a partial + charge. The + charge on the N withdaws the e- from the benzene ring deactivating it.
NH2- On the other hand N is once again bonded to the benzene ring. H has the + charge and N has the - charge in this case. Therefore the N is donating its - charge to the ring making NH2 a (o/p) directing activator.
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