JordanL_
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Can something be part of lots of functional groups at the same time?

For example, an acyl group is RCOZ and a carbonyl group is C=O and a carboxyl group is RCOOH. So would a carbon in a carboxylic acid be part of an acyl, carboxyl and carbonyl group at the same time?

I'm really confused about this.

Does the R in a functional group only represent a continuation of the carbon chain, or can it represent any atom? What about the Z in acyl?
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Peroxidation
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The R usually represents a carbon chain. The Z in acyl groups represents a halogen, oxygen atom or nitrogen atom.

An acyl compound contains an acyl group whose carbonyl carbon atom is directly bonded to a nitrogen, oxygen or halogen atom.

A carbonyl compound contains an acyl group whose carbonyl carbon atom is directly bonded to either hydrogen or carbon.

So for a carboxylic acid: R-C(-OH)=O

The carbonyl group is the C=O part
The acyl group is the R-C=O part
The carboxyl group is the C(-OH)=O part
The hydroxyl group is the O-H part
The ester group is the R-C(=O)-O-R part

With the overall functional group being R-C(-OH)=O

Please note that the diagrams I've typed in aren't how you'd actually write them on paper, I've had to use brackets like (-OH) to show that a hydroxyl group is on that carbon atom as well as another group.
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