Answer
$Ne < C_2H_6 < CH_3CH_2OH < KBr$
Work Step by Step
$Ne$ only has Vandewaals interaction which is the weakest.
$C_2H_6$ has higher mass and Vandewaals
$CH_3CH_2OH$ has Hydrogen bonding which is stronger.
$KBr$ has ionic bonding so its the strongest.
Boiling points increase in order:
$Ne < C_2H_6 < CH_3CH_2OH < KBr$
