D. Hydroxy
- A hydroxy or hydroxyl group is a functional group with the chemical formula -OH and composed of one oxygen atom covalently bonded to one hydrogen atom.
- Hydroxyl groups are polar, and the oxygen side is always negative, while the hydrogen side is always positive.
- The functional group of the alcohols is the hydroxyl group, –OH.
- For example: Methanol is an alcohol containing hydroxyl functional group.
Therefore, the correct option is option D.
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