MHTCET 17 Apr 2026 Shift 1 Paper

Concept:Boiling point depends on the strength of intermolecular forces present in the organic compound.Explanation:Carboxylic acids have the highest boiling points because they form strong hydrogen-bonded dimers: $2\mathrm{RCOOH} \rightleftharpoons (\mathrm{RCOOH})_2$.This strong dimer formation gives them very high intermolecular attraction.Alcohols also show hydrogen bonding because of the presence of the $-OH$ group.However, alcohols do not form stable dimers like carboxylic acids, so their boiling points are lower.Aldehydes and ketones lack an $-OH$ bond, so they cannot form hydrogen bonds with themselves.They show only dipole-dipole interactions due to the polar carbonyl group $\mathrm{C=O}$.Among aldehydes and ketones of comparable molecular mass, ketones are more polar and show slightly higher boiling points.Thus, the decreasing order of boiling points is:Carboxylic acid > Alcohol > Ketone > Aldehyde.Answer:Option B: Carboxylic acid > Alcohol > Ketone > Aldehyde.