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AP EAMCET2010ChemistryAlcohols Phenols and Ethers

Which one of the following gives yellow precipitate with iodine and NaOH solution?

Options

  1. ACH ₃- CHO
  2. BC ₆ H ₅ COC ₆ H ₅
  3. CHCHO
  4. DCH ₃ OH

Correct answer

A. CH ₃- CHO

Step-by-step solution

Alcohols containing CH ₃ CH ( OH )- group and carbonyl compounds containing CH ₃ CO - group give yellow precipitate with iodine and NaOH solution. This reaction is called iodoform test. Thus, CH ₃ CHO due to presence of CH ₃ CO group gives yellow ppt with I ₂ and NaOH . CH ₃ CHO +3 I ₂+4 NaOH CHI ₃ + HCOONa +3 NaI +2 H ₂ O

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