How many acyclic carbonyl compounds (aldehydes and ketones) of molecular formula C5H10O give a yellow precipitate with NaOH/I2? Count constitutional isomers only (no stereoisomers).

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JEE Main levelSingle correct optionDifficulty 2 of 3si111

How many acyclic carbonyl compounds (aldehydes and ketones) of molecular formula $C X_{5} H X_{10} O$ give a yellow precipitate with $NaOH / I X_{2}$ ? Count constitutional isomers only (no stereoisomers).

Answer: C

The seven acyclic carbonyl isomers are pentanal, 2-methylbutanal, 3-methylbutanal, 2,2-dimethylpropanal, pentan-2-one, pentan-3-one and 3-methylbutan-2-one. The iodoform test needs

CH X_{3} CO X^{-}

, which is present only in pentan-2-one and 3-methylbutan-2-one. The count is 2.

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How many acyclic carbonyl compounds (aldehydes and ketones) of molecular formula CX5​HX10​O give a yellow precipitate with NaOH/IX2​? Count constitutional isomers only (no stereoisomers).

Answer: C

More questions on Structure determination from reaction sequences

How many acyclic carbonyl compounds (aldehydes and ketones) of molecular formula $C X_{5} H X_{10} O$ give a yellow precipitate with $NaOH / I X_{2}$ ? Count constitutional isomers only (no stereoisomers).