Question -
The boiling points of aldehydes and ketones lie in between alkanes and alcohols of comparable masses because:
Options:
A .  alkanes are polar
B .  aldehydes and ketones are non-polar
C .  alkanes are non-polar and aldehydes and ketones contain polar ╲╱C=O group and lower alcohols have H-bonding
D .  alkanes are held together by weak van der Waals’ forces (being non-polar), aldehydes and ketones contain polar ╲╱C=O and held together by strong dipole-dipole attraction and lower alcohols have H-bonding, which is stronger than dipole-dipole attraction
Answer: Option D : D Alcohols have hydrogen bonding and this tendency decreases in the order −OH>−CHO>ketones>R−H
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