MCQ
Given below are two statements:

Statement $I:$ The boiling points of aldehydes and ketones are higher than hydrocarbons of comparable molecular masses because of weak molecular association in aldehydes and ketones due to dipole - dipole interactions.

Statement $II:$ The boiling points of aldehydes and ketones are lower than the alcohols of similar molecular masses due to the absence of $H$-bonding.

In the light of the above statements, choose the most appropriate answer from the options given below :

  • A
    Both Statement $I$ and Statement $II$ are incorrect.
  • B
    Statement $I$ is correct but Statement $II$ is incorrect.
  • C
    Statement $I$ is incorrect but Statement $II$ is correct.
  • Both Statement $I$ and Statement $II$ are correct.

Answer

Correct option: D.
Both Statement $I$ and Statement $II$ are correct.
d
Boiling point of comparable molecular mass molecules

$R - OH \,>\,\,\,\,\,\,\,\,\,\,\,$ Aldehyde - Ketone $\,>\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,$ Alkane

H-bonding $\,\,\,\,\,\,\,\,\,\,\,\,\,$ Dipole-dipole interaction $\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,$ Non-polar

(strong molecular $\,\,$ (weak molecular association)

association)

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