At 150 degrees Celsius, four of these substances are gases, and one is a liquid. Which one is the liquid?

Question

A) CH₄

B) HOCH₂CH₂OH

C) CH₃OH

D) CH₃CH₃

E) CH₃OCH₃

Answer 1

B - this is ethylene glycol. Even if you don't know the name or what it is - look at the intermolecular forces. It has two -OH groups that will form hydrogen bonding which is the strongest intermolecular force in molecular compounds. C also has hydrogen bonding but with only one -OH group the intermolecular forces will be weaker.