The answer to this question is quite simple
Among ketones alcohols and aldehydes aldehydes have least boiling point
So we have option a and B
Also
With increase in the methyl group of any compund it's boiling point starts to increase so
Option B will have more boiling point then option A
So the answer to this question is CH3CHO with lowest boiling point of around 20.2 °C
I hope this helps. If you have any query or want more detailed explanation, feel free to ask in the comments section below.
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