13. Ortho nitro phenol is more volatile than metanitrophenol. Why?
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Ortho nitro-phenol has intramolecular hydrogen bonding , para nitro-phenol has intermolecular hydrogen bonding hence para nitro-phenol has more intermolecular force of attraction . They have the same molecular weight so the compound having less intermolecular force of attraction is more volatile i.e. orthonitrophenol
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