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JEE Main levelSingle correct optionDifficulty 2 of 3hc043

An alkene on reductive ozonolysis gives only ethanal and propanal. The alkene is

  1. A (pent-1-ene)
  2. B (2-methylbut-2-ene)
  3. C (3-methylbut-1-ene)
  4. D (pent-2-ene)

Answer: D

Reassembling the two carbonyl carbons with a double bond gives . Pent-1-ene would give methanal and butanal, 2-methylbut-2-ene gives propanone and ethanal, and 3-methylbut-1-ene gives methanal and 2-methylpropanal.
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