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The number of compounds among ethanol, propan-2-ol, acetophenone, pentan-3-one, acetaldehyde, butan-2-one, benzaldehyde, propan-1-ol and…

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The number of compounds among ethanol, propan-2-ol, acetophenone, pentan-3-one, acetaldehyde, butan-2-one, benzaldehyde, propan-1-ol and 1-phenylethanol that give a yellow precipitate with

\mathrm{I_2/NaOH}

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Answer: 6

The haloform (iodoform) test needs a

\mathrm{CH_3CO{-}}

group or a

\mathrm{CH_3CH(OH){-}}

group (oxidised in situ). Positive: ethanol, propan-2-ol, acetophenone, acetaldehyde, butan-2-one and 1-phenylethanol. Negative: pentan-3-one (no methyl ketone), benzaldehyde (no

\alpha

-methyl) and propan-1-ol (primary alcohol other than ethanol). Count

=6

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