The relationship between alcohol polarity, molecular structure (such as alkyl chain length), and aqueous miscibility is a fundamental chemical principle that does not require citation.
The claim states that the polarity of alcohols determines their miscibility in water, which is a well-established, basic chemical principle governed by molecular interactions like hydrogen bonding and the hydrophobic effect (e.g., lower molecular weight alcohols are completely miscible due to hydrophilic hydroxyl groups, whereas longer alkyl chains decrease water solubility). Per the instructions, statements that are trivially true by direct everyday observation or fundamental chemical definitions are categorized as common knowledge and require no citation.