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JEE Main levelSingle correct optionDifficulty 2 of 3co072

Heptane-2,6-dione, , is heated with dilute NaOH. The intramolecular aldol condensation product is

  1. A3-methylcyclopent-2-en-1-one
  2. B3-methylcyclohex-2-en-1-one
  3. C2-methylcyclohex-2-en-1-one
  4. Dcyclohex-2-en-1-one

Answer: B

The enolate from a terminal methyl (C1) attacks C6, forming a ring of C1 to C6, so a six-membered ring. Attack from C3 on C6 would give a strained four-membered ring. Dehydration gives 3-methylcyclohex-2-en-1-one.
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