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JEE Main levelSingle correct optionDifficulty 2 of 3si001

In Victor Meyer's test, propan-2-ol is converted successively to the alkyl iodide (red P/), the nitroalkane (), then treated with and finally made alkaline with NaOH. The colour observed is

  1. Ablue
  2. Bcolourless
  3. Cyellow
  4. Dblood red

Answer: A

Victor Meyer's test classifies alcohols by the product of the nitroalkane with . Primary alcohols give a nitrolic acid and a red colour with NaOH, secondary alcohols give a pseudonitrole and a blue colour, and tertiary alcohols give no colour. Propan-2-ol is secondary, so the colour is blue.
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