Answer
$ cyclohexane-1,2-diol$ is the most soluble in water.
Work Step by Step
$ cyclohexane-1,2-diol$ is the most soluble in water because it has two $-OH$ groups for forming hydrogen bonds with water. Next is $cyclohexanol$ which has one $-OH$ group for hydrogen bonding. Lastly, $chlorocyclohexane$ cannot form hydrogen bonds and is the least soluble in water.