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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3hx245

The Grignard reagent is prepared from the halide shown. Each option gives an electrophile (each followed by ) and the structure claimed as the major product. Select all options in which the product is correct.

  1. AWith : Structure A
  2. BWith : Structure B
  3. CWith acetone: Structure C
  4. DWith ethylene oxide: Structure D

Answer: A, C

Isopropylmagnesium bromide with CO2 gives 2-methylpropanoic acid (correct). With HCHO it gives 2-methylpropan-1-ol, but Structure B (3-methylbutan-2-ol) is the ethanal product, so B is wrong. With acetone it gives 2,3-dimethylbutan-2-ol (correct). With ethylene oxide it adds two carbons, giving 3-methylbutan-1-ol; Structure D has three carbons added, so D is wrong.
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