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The propan-1-yl group, also known as the n-propyl group, is an alkyl substituent derived from propane by the removal of one hydrogen atom from either of the terminal carbon atoms. Its chemical formula is CH3CH2CH2-. This group is a three-carbon chain with a linear arrangement. It is structurally distinct from its isomer, the isopropyl group (or propan-2-yl group), which is formed by removing a hydrogen atom from the central carbon atom of propane. The propan-1-yl group is a common structural feature in many organic molecules, including alcohols, ethers, and alkanes. For example, 1-propanol contains a propan-1-yl group attached to a hydroxyl group. Similarly, in propyl acetate, the propan-1-yl group is bonded to an oxygen atom which is part of the acetate ester functional group. Its presence influences the physical and chemical properties of molecules, such as solubility, boiling point, and reactivity, in ways characteristic of unbranched alkyl chains.