The solubility of an alcohol depends on the length of the alkyl chain in the molecule.
An alcohol is an organic compound that contains the -OH group. We have to note that the shape of an alcohol have a profound impact on its solubility. tert-butanol is the most soluble of the three because of its small surface area.
Based on size, 1-butanol is relatively more soluble than 1-pentanol because solubility of alcohols decreases as the length of the alkyl chain increases.
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