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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ap054

Which statements about distinguishing tests are correct?

  1. AEthane-1,2-diol reacts with whereas ethanol does not.
  2. BPhenol gives a white precipitate with bromine water whereas cyclohexanol does not.
  3. CButan-1-ol and 2-methylpropan-2-ol can be distinguished by Lucas reagent at room temperature.
  4. DEthanol gives a silver mirror with Tollens' reagent.

Answer: A, B, C

Vicinal diols are cleaved by periodic acid (statement 1). Phenol is brominated to 2,4,6-tribromophenol (statement 2). The tertiary alcohol gives immediate turbidity while the primary alcohol gives none (statement 3). Alcohols do not reduce Tollens' reagent (statement 4 is false).
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