ㄙㄨㄛ[1][2](英語:carboxyl group),化學式–C(=O)OH[3],是羧酸所具有的官能基。一般而言,羧基上的有較大的游離傾向,從而使羧酸在水溶液中顯酸性羧酸根負離子所具有共軛結構可以看作是氫易游離的潛在動力。

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羧基

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