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JEE Main levelSingle correct optionDifficulty 2 of 3ro151

The ester , in which the oxygen attached to the ethyl group is the isotope 18O, is hydrolysed with aqueous NaOH by the usual acyl-oxygen cleavage. The label is found in

  1. Aboth ethanol and ethanoate ion
  2. Bthe ethanoate ion
  3. Cthe water
  4. Dethanol

Answer: D

In base-catalysed hydrolysis (BAC2) hydroxide attacks the carbonyl carbon and the acyl-oxygen bond breaks. The oxygen originally bonded to the ethyl group leaves with it as ethoxide, so the label ends up in ethanol.
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