Question

Which of the following compounds has the lowest boiling point?

• A. $CH_3 CH_2 CH_2 CH_2 CH_3$
• B. $CH_3 CH=CH- CH_2 CH_3$
• C. $CH_3 CH=CH- CH =CH_2$
• D. $CH_3 CH_2 CH_2 CH_3$

Answer 1

Answer: (D)

$CH_3 CH_2 CH_2 CH_3$

Answer 2

Boiling points of alkanes increase as the number of carbon atom increase or molecular mass increase. Alkenes have high boiling point, so $CH_3 CH_2 CH_2 CH_3$ has the lowest boiling point.