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JEE Main levelOne or more correct optionsDifficulty 2 of 3ro029

Which statements about the Birch reduction (Na, liquid , ethanol) are correct?

  1. ABenzene gives cyclohexa-1,4-diene.
  2. BA methoxy substituent is found on a double-bond carbon in the product.
  3. CThe 1,4-diene product is quickly reduced further to cyclohexene under the same conditions.
  4. DA carboxylic acid substituent is found on an sp3 carbon in the product.

Answer: A, B, D

Benzene gives the 1,4-diene (A), electron-donating OMe stays on sp2 carbon (B) and electron-withdrawing COOH ends on sp3 carbon (D). Isolated alkenes are not reduced by Na/, so C is false.
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