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JEE Advanced levelSingle correct optionDifficulty 3 of 3o4158

1.510 g of 2-bromo-2-methylbutane () was heated in ethanol. Isolation gave 0.140 g of alkenes (, ) and 0.812 g of 2-ethoxy-2-methylbutane (); the rest of the bromide was recovered unchanged. The percentage of the consumed substrate that reacted by elimination is closest to

  1. A20.0%
  2. B22.2%
  3. C28.6%
  4. D77.8%

Answer: B

Moles of alkene mmol and of ether mmol. The substrate consumed is mmol. The elimination percentage is . (Dividing by the 10.0 mmol originally taken gives 20.0%, which is wrong because some bromide was not consumed.)
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