Question

Which of the following molecules would you except to have the highest boiling point?

• A. $C_2{H}_8$
• B. $C_3{H}_8$
• C. $C_4{H}_8$
• D. $C_4{H}_{10}$

Answer 1

The correct option is D $C_4{H}_{10}$

The reason that longer chain molecules have higher boiling points is that longer chain molecules become wrapped around and enmeshed in each other. More energy is needed to separate them than short-chain molecules which have only weak forces of attraction for each other.

Hence, option D is correct.