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JEE Advanced levelSingle correct optionDifficulty 3 of 3el194

Dodecan-1-ol is treated with conc. and the product is neutralised with NaOH to give a surfactant Z. Which description of Z is correct according to the standard NCERT treatment?

  1. AAnionic detergent with a linear chain, biodegradable and forming no scum in hard water
  2. BCationic detergent with germicidal action, forming scum in hard water
  3. CA soap, since it is the sodium salt of a fatty acid
  4. DNon-ionic detergent containing an ester linkage

Answer: A

The product is , sodium lauryl sulphate: a sulphate ester salt, so it is anionic and not a carboxylate soap. Its unbranched chain makes it biodegradable, and it does not give scum with or in hard water.
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