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Organic Chemistry Reagents
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Which of the following reagents is used as a divalent counterion?
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A
Armstrong's acid
💡 Explanation:
Armstrong's acid is a strong acid which is related to toluenesulphonic acid and is used in chemical synthesis. It is sometimes used as a divalent counterion for forming salts of basic drug compounds, as an alternative to the related mesylate or tosylate salts.