Answer:
The alkyl group (R) tends to stabilize
the \[>C=O\] group by releasing the electrons (\[+I\]effect) towards the \[s{{p}^{2}}\]hybridized
carbon atom. As a result, the polarity of the bond is likely to decrease and
stability will therefore, increase. Ketones with two such groups are more
stable than the corresponding aldehydes having only one alkyl group.
Consequently their boiling points are slightly higher. For example, boiling
points of isomeric propanal and propanone are 322 K and 329 K respectively.
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