Arrange cyclohexane, KCL, CH₃OH, CH₃CN in order of their increasing solubility in n octane.

 

The solubility of a non-polar solute is more than that of a polar solute in the n-octane. n-octane is a non-polar solvent.

Cyclohexane  : non-polar

KCl                : ionic

CH₃OH           : polar covalent

CH₃CN           : weakly polar covalent

The order of increasing polarity is:

Cyclohexane < CH₃CN <  CH₃OH < KCl

Reason:

Cyclohexane and n-Octane are non polar solvents and hence mix with each other in all proportions.

KCl is an ionic compound and n-octane is non polar, therefore do not dissolve in n-octane.

Methyl alcohol and methyl cyanide both are polar compounds, but methyl alcohol is more polar, and methyl cyanide is less polar. So methyl cyanide will dissolve more in n-octane .

Therefore, the order of increasing solubility is:

KCl < CH₃OH < CH₃CN < Cyclohexane