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A carboxyl group is a functional group that consists of two functional groups connected to a single carbon atom: hydroxyl (OH) and carbonyl (C=O).This group contains a carbon atom double-bonded to an oxygen atom and singly linked to a hydroxyl group.

On the other hand, thecarbonyl group, which has the chemical formula C=O, is a functional group that consists of one carbon atom double-bonded to an oxygen atom.

Suppose an OH group of the carboxyl group is replaced with the hydrogen atom.In this case, the group contains carbon that is double-bonded to an oxygen atom which is the structure of the carbonyl functional group.

Therefore, the given option is true.

The thiol group is also known as the sulfhydryl group (-SH).If the thiol group is added to the OH group, it leads to forming a compound containing a sulfur atom.

Thus, this reaction does not form a carbonyl group as the carbonyl group does not contain sulfur atoms.

Therefore, the given option is false.

A phosphate group is a functional group that consists of a phosphorus atom and four oxygen atoms. If a hydroxyl group is added to a phosphate group, it leads to the formation of a compound containing a phosphorus atom.

Thus, this reaction does not form a carbonyl group as the carbonyl group does not contain phosphorus.

Therefore, the given option is false.

Amines are organic ammonia derivatives in which one or more of the three hydrogen atoms have been replaced by a carbon group.If the nitrogen of amines is replaced with an oxygen atom, it leads to a compound that contains no carbon atom.

Thus, this reaction does not form a carbonyl group as the carbonyl group contains a carbon atom.

Therefore, the given option is false.