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COMEDK2024ChemistryGeneral Organic Chemistry

Presence of peroxides in old stocks of ethers can be tested by first treating them with Fe ²⁺ ions and then adding an aqueous solution of

Options

  1. AKCNS
  2. BHgCl ₂
  3. CSnCl ₂
  4. DKI

Correct answer

A. KCNS

Step-by-step solution

Peroxides, if present, in old stocks of ethers oxidise Fe ²⁺ to Fe ³⁺ ions which then combines with KCNS to form blood red colouration due to formation of ferric sulphocyanide. aligned & Fe ²⁺ Peroxide Fe ³⁺ & Fe ³⁺+3 KCNS Fe ( CNS )₃+3 ~K ⁺ aligned

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