Answer: aldehyde
Explanation:
Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
1. Amides have functional group
.
Example: Ethanamide with molecular formula
2. Aledydes have functional group
.
Example: Ethanal with molecular formula
3. Ketones have functional group
.
Example: Propanone with molecular formula
4. Esters have functional group
.
Example: methyl ethanoate with molecular formula
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