Question

Which one of the following has minimum boiling point ?

• A. n-butane
• B. 1-Butyne
• C. 1-Butene
• D. Isobutene

Answer 1

Answer: (D)

Isobutene

Answer 2

Boiling Point $\propto$ surface area $\propto$ $\frac{1}{Branching}$

Isobutene has smallest vander wall surface area of contact so its boiling point least.