The vapour pressure of o-nitrophenol is greater than p-nitrophenol because of:

dipole moment

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dipole - dipole interaction

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H - bonding

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lattice structure

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Solution

The correct option is C H - bonding
There is intramolecular hydrogen bonding in o-nitrophenol. It increases the volatile nature of the molecule. So, it has more vapor pressure. There is intermolecular hydrogen bonding in p-nitrophenol which increase its b.p. so the vapor pressure decreases.
Option C is correct.

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