The total number of atoms remains unchanged, <em>always.</em> But the chemical properties change :)
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A specific combination of bonded atoms which always react in the same way, regardless of the particular carbon skeleton is known as the functional group. These are specific groups of atoms or bonds within organic molecules that accounts for the characteristic chemical reactions of those molecules. Examples of functional groups are the Carbonyl group, alkyl Halides, aldehydes and ketones among others.
Answer:
Formic acid H. COOH
Acetic acid CH3.COOH
Propionic acid CH3 . CH1 . COOH
Butyric acid CH3 . CH1 . CH1 . COOH
Explanation:
