Multiple choice

Which of the following reagents is used as a divalent counterion?

  1. Acetyl chloride

  2. AD-mix

  3. Anhydrous aluminium trichloride

  4. Armstrong's acid
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D Correct answer
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.

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