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JEE Advanced levelSingle correct optionDifficulty 3 of 3el244

A dilute solution of the compound shown is mixed with aqueous silver nitrate. Which result is expected?

  1. ANo change, since quaternary ammonium salts do not ionise
  2. BA white precipitate of silver chloride
  3. CA pale cream precipitate of silver bromide
  4. DA black precipitate of silver

Answer: C

The compound shown is cetyltrimethylammonium bromide, an ionic salt that dissociates into the large cation and Br-. Br- gives a pale cream precipitate of AgBr with Ag+. The quaternary cation carries no hydrogen to lose, and no chloride is present.
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