MCQ
Which of the following has minimum $pK _{ b }$ value?
- ✓N-methyl methan amine
- BN,N-dimethyl methan amine
- CMethanamine
- DBenzenamine
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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 :
