How does ortho nitrophenol different from p nitrophenol?
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It is simple to answer such questions. See as in the two they differs in only one thing the pos. Of nitro group attached to benzene, so the cmp. having nitro attached at ortho will form intramolecular hydrogen bonding with the alcohol gp.(-OH) and similarly the para one forms intermolecular hydrogen bonding with alcoholic group……… annnnd we have studied that the bond strength of intramolecular H-Bonding is lower than intermolecular H-Bonding, hence the boiling point will in the order:- o-nitrophenol < p-nitrophenol.
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