Yaar, in the lab, it's all about the electron density. Nitro group pulls electrons away, deactivating the ring and stabilizing meta carbocation intermediate. Hydroxyl group donates electrons, activating ortho/para positions. But honestly? My real proof is in failed syntheses and costly purifications—trying to force a nitrophenol substitution ortho is like expecting my biryani to cook without dum, it just won't give you the desired product, only unwanted isomers.
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