Explain why low molecular mass alcohols are soluble in water.

The low molecular mass alcohols are soluble in water due to presence of intermolecular hydrogen bonding between alcohol molecules and this is possible due to the presence of polar –OH group in alcohol.

With increase in the alkyl group of alcohol or in case of high molecular mass alcohols, it suppresses the effect of polar nature of –OH group of alcohol. Thus, solubility of alcohol decreases with increases in molecular size.