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Number of molecules from below which cannot give iodoform reaction is : Ethanol, Isopropyl alcohol, Bromoacetone, 2 - Butanol, 2 - Butanone, Butanal, 2 - Pentanone, 3 - Pentanone, Pentanal and 3 - Pentanol.

1. 2
2. 5
3. 3
4. 4

Correct answer: 4

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