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Following are the anions of soap which form Ca and Mg ions which we see as curd in water

Correct answer: D. Both A & B

  • A. Sodium hexadecanoate
  • B. Sodium octadecanoate
  • C. Sodium pentadecanoate
  • D. Both A & B

Explanation

Sodium hexadecanoate and sodium octadecanoate are soaps whose anions form insoluble calcium and magnesium salts, producing curdy scum in hard water. Choosing only one is the likely mistake, because both palmitate and stearate ions react with Ca2+ and Mg2+ to form insoluble salts.

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About Functional Groups

Functional groups are specific atoms or atom groups that determine the characteristic reactions and properties of organic compounds. Coverage includes alkenes, alkynes, halo, hydroxyl, ether, carbonyl, carboxyl, ester, amino and nitro groups, together with their structures, nomenclature and related homologous series.

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