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Subject - Chemistry:

Basics

MCQ - 337-2523

Question:

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

  1. Zinc dust and soda lime
  2. Soda lime and zinc dust
  3. Zinc dust and sodium hydroxide
  4. Soda lime and zinc dust

Correct Answer: B

Explanation:

Benzene can be made by heating soda lime with solid benzoic acid (benzenecarboxylic acid), C6H5COOH.

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The first a reaction between the acid and the soda lime to make sodium benzoate, and then a decarboxylation is followed. Phenol is reduced to benzene when it is distilled with zinc dust or its vapour is passed over granules of zinc at 400°C. C6H5OH + Zn → C6H6 + ZnO

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