Q8 / 180 · KCET 2010 · Chemistry

Out of the compounds below the vapour pressure of (B) at a particular temperature is
Figure

  • Correct answer
    A
    higher than that of (A)
  • B
    lower than that of (A)
  • C
    higher or lower than (A), depending on the size of the vessel
  • D
    same as that of (A)

Solution

In (A) para-nitro phenol intermolecular (between two molecules) H-bonding exists while in $(B)$ ortho- nitro phenol, intramolecular H-bonding exists. Because of the presence of intramolecular H-bonding, the boiling point of $(B)$ is lower as compared to $(A)$ and thus, $(B)$ is more volatile, ie, has higher vapour pressure as compared to (A).

Hence, the correct answer is option: 'A'.

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