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States of Matter — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStates of Matter1 Mark
MCQ
The vapour pressure of $o-$nitrophenol at any given temperature is predicted to be:
  • ✓
    Higher than that of $p-$nitrophenol
  • B
    Lower than that of $p-$nitrophenol
  • C
    Same as that of $p-$nitrophenol
  • D
    Same as that of $p-$nitrophenol
✓

Answer

Correct option: A.
Higher than that of $p-$nitrophenol
In $o-$ nitrophenol , there is intra$-$molecular as as well as inter$-$molecular hydrogen bonding while in $p-$nitrophenol there is only inter$-$molecular hydrogen bonding. Therefore, it is difficult to vaporize $o-$nitrophenol than $p-$nitrophenol . Hence the vapour pressure of $o-$nitrophenol is higher than that of $p-$nitrophenol.

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