Rank the following compounds in order of decreasing vapor pressure. Rank from highest to lowest vapor pressure. To rank items as equivalent, overlap them. View Available Hint(s) Reset Help CH3CHCH2CH3 CH3CH2CH2CH2OH CH3CH2CH2CH2CH3 CH4 CH3 Highest Lowest The correct ranking cannot be determined. 

Higher intermolecular forces present within the compound will have low vapour pressure.

CH4 has very weak vanderwall force so it has very high vapour pressure

2-methylbutane has Vander wall force greater than the CH4 so it's vapour pressure will be slightly less

Pentane has high Vander wall forces because structure is symmetrical so it has low vapour pressure.

Butanol has hydrogen bonding so it will have very low vapour pressure.

Correct order

4 , 2 ,3, 1