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JEE Advanced levelSingle correct optionDifficulty 3 of 3nm156

The number of open-chain structural isomers of that are aldehydes or ketones (no stereoisomers) is

  1. A9
  2. B7
  3. C8
  4. D6

Answer: B

Aldehydes come from the four butyl groups: pentanal, 2-methylbutanal, 3-methylbutanal, 2,2-dimethylpropanal (4). Ketones: pentan-2-one, pentan-3-one, 3-methylbutan-2-one (3). Total 4 + 3 = 7.
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