Q43 / 150 · MHT CET 2026 (18 April Shift 1) · Chemistry
Which among the following has lowest boiling point?
- An - Butyl alcohol
- BIsobutyl alcohol
- Csec-Butyl alcohol
- Correct answerDtert-Butyl alcohol
Solution
The boiling point of isomeric alcohols decreases with an increase in branching.
As branching increases, the molecule becomes more spherical in shape, which decreases the surface area. A smaller surface area leads to weaker van der Waals forces of attraction between the molecules, thereby lowering the boiling point.
Among the given isomers of butyl alcohol, tert-butyl alcohol is the most branched.
Therefore, tert-butyl alcohol has the lowest boiling point.
Answer: tert-Butyl alcohol
As branching increases, the molecule becomes more spherical in shape, which decreases the surface area. A smaller surface area leads to weaker van der Waals forces of attraction between the molecules, thereby lowering the boiling point.
Among the given isomers of butyl alcohol, tert-butyl alcohol is the most branched.
Therefore, tert-butyl alcohol has the lowest boiling point.
Answer: tert-Butyl alcohol
Hence, the correct answer is option: 'D'.