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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3el246

The fatty acid shown is the parent of one surfactant among the four structures shown. Select all of the four structures shown that have a negatively charged hydrophilic head group.

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: A, B

Structure A is sodium palmitate (carboxylate) and structure B is sodium lauryl sulphate (sulphate); both have anionic heads. Structure C is cetyltrimethylammonium bromide (cationic head) and structure D is a polyethoxylate (uncharged head).
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