Based on the solute solvent interactions, arrange the following in the order of increasing solubility in n-octane.

A. Cyclohexane

B. KCl

C. CH₃OH

D. CH₃NH₂

E. CH₃CN

B < C < E < D < A

n-Octane is nonpolar and can dissolve non-polar solutes. It cannot dissolve polar (and ionic) solutes.

Cyclohexane is non-polar. Hence, easily soluble in n-octane.

Methyl amine (CH₃NH₂) is less soluble than cyclohexane due to partial polar character due to electronegativity difference between carbon and nitrogen.

Methanol (CH₃OH) and acetonitrile (CH₃CN) are polar and have very low solubility in n-octane.

KCl is ionic compound and hence, insoluble in n-octane.

Correct order of increasing solubility is B < C < E < D < A.