羥基,又叫氫氧基,化學式-OH,係一個官能團。裏面嘅氫同氧用共價鍵連埋一齊,渠係帶極性嘅,因爲氧嘅電負性高過氫。個羥字係新造嘅,由氫同氧兩個字合埋一齊。
羥基算係一種有機官能團。一個烴基連住羥基,就係醇啦。例子有甲醇、乙醇等等。如果喺連著羥基嘅碳上邊有個羰基(C=O基團)嘅話,咁樣渠就係羧酸,有一個-COOH嘅基團(羧基)。
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