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JEE MainChemistryAldehydes and Ketones

Which of the following reactants (or pair of reactants) will undergo aldol condensation to yield 2-methylenecyclohexan-1-one as the major product upon treatment with a dilute base followed by heating?

Options

  1. ACyclohexanone and formaldehyde
  2. BHeptanedial
  3. C6-Oxoheptanal
  4. DCyclohexanone and acetaldehyde

Correct answer

A. Cyclohexanone and formaldehyde

Step-by-step solution

To identify the precursors, perform a retrosynthetic cleavage of the , -unsaturated double bond in 2-methylenecyclohexan-1-one. The structure of 2-methylenecyclohexan-1-one consists of a cyclohexanone ring with an exocyclic = CH ₂ group at the -position. Cleaving the exocyclic C = C double bond gives two fragments. The = CH ₂ group receives an oxygen atom, becoming formaldehyde ( HCHO ). The ring carbon receives two hydrogen atoms, becoming cyclohexanone. Since the cleavage results in two separate molecules, the pr

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