Ao, this mechanism is always giving me trouble! The nitro group pulls electrons away, so it makes the ring less reactive and guides new subs to the meta position. But OH group, it shares electrons, makes the ring more happy and reactive for ortho-para attack. Honestly, I just remember it like this: NO2 is like a difficult customer on my delivery list—hard to please and directs you elsewhere. But OH is like the aunties in my village, they always pull you close to give you tea and snacks, so ortho-para. My life is more about directions on hill roads than on benzene rings, I tell you.
#exams#study
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