JEE Main20266 April 2026Morning ShiftChemistryAlcohols Phenols and EthersActual
Arrange the following compounds according to increasing order of boiling points. n - C ₄ H ₉ OH (A), n - C ₄ H ₉ NH ₂ (B), n - C ₄ H ₁₀ (C) and C ₂ H ₅ NHC ₂ H ₅ (D).
Options
- AC < B < A < D
- BD < C < B < A
- CC < D < B < A
- DD < B < A < C
Correct answer
C. C < D < B < A
Step-by-step solution
Boiling point depends on the strength of intermolecular forces. n -C ₄ H ₁₀ (C) is a nonpolar alkane with only weak van der Waals forces, resulting in the lowest boiling point. n -C ₄ H ₉ OH (A) is an alcohol that forms strong intermolecular hydrogen bonds due to the high electronegativity of oxygen, giving it the highest boiling point. Both n -C ₄ H ₉ NH ₂ (B) and C ₂ H ₅ NHC ₂ H ₅ (D) are amines and form hydrogen bonds, which are weaker than those in alcohols because nitrogen is less electronegative than oxygen.