Protonation of carbonyl group forms a cation with significant charge on the carbon atom

How many of the following carbonyl compounds form an aromatic cation only after protonation?

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Solution

The above compounds are aromatic after protonation of carbonyl group.
This compound is aromatic both before and after protonation.

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Protonation of carbonyl group forms a cation with significant charge on the carbon atom How many of the following carbonyl compounds form an aromatic cation only after protonation?

The above compounds are aromatic after protonation of carbonyl group. This compound is aromatic both before and after protonation.

Protonation of carbonyl group forms a cation with significant charge on the carbon atom

How many of the following carbonyl compounds form an aromatic cation only after protonation?

The above compounds are aromatic after protonation of carbonyl group.
This compound is aromatic both before and after protonation.