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JEE Advanced levelSingle correct optionDifficulty 3 of 3el198

A fat is heated with aqueous NaOH to give a soap A and a trihydric alcohol B. Solution of A gives a white precipitate C with . B is then treated with a mixture of conc. and conc. to give an explosive ester D. Which statement is correct?

  1. AC is the calcium salt of the fatty acid, and each mole of B reacts with 3 mol of to give D
  2. BC is calcium carbonate, and each mole of B reacts with 1 mol of
  3. CC is the free fatty acid, and each mole of B reacts with 3 mol of
  4. DC is the calcium salt of the fatty acid, and each mole of B reacts with 2 mol of

Answer: A

B is glycerol and A is the sodium soap; precipitates the insoluble calcium soap C. Glycerol has three groups, all esterified: . D is glyceryl trinitrate, so 3 mol of nitric acid are used per mole of B.
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