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Which of the following best represents an untimed test that has items arranged in increasing order of difficulty?
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Acylium Ion
A positive ion (cation) characterized by the presence of a carbon atom double-bonded to an oxygen atom and bonded to an alkyl or aryl group, but lacking a hydrogen atom.
Butanoyl Chloride
A reactive acyl chloride compound with the chemical formula C4H7ClO, used in organic synthesis to introduce butanoyl functional groups.
Acylium Ion
A positively charged ion with the structure R-CO+, where R is an alkyl or aryl group, significant in various organic reactions.
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