which one is more volatile o-nitro benzene or p-nitro benzene
 

o-nitro benzene is more volatile and has a lower boiling point than p-nitrophenol.  This is because of inter molecular hydrogen bonding in the para isomer and intramolecular hydrogen bonding in the ortho isomer.

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https://www.meritnation.com/ask-answer/question/why-o-nitrophenol-has-lower-boiling-point-than-p-nitrophenol/alcohols-phenols-and-ethers/6761547

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