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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3o1152

Which of the following, when added to ethylmagnesium bromide in dry ether, produce ethane?

  1. Apropyne,
  2. Bdiethyl ether
  3. C
  4. D

Answer: A, C, D

A Grignard reagent is a very strong base (conjugate acid ethane, pKa about 50) and takes a proton from water, alcohols and terminal alkynes to give ethane. Diethyl ether has no acidic proton and is simply the solvent.
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