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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

Solution

The iodoform reaction occurs with compounds that have a methyl group adjacent to a carbonyl or hydroxyl group. In this case, 2-Butanol, 2-Butanone, and 3-Pentanol do not meet this criterion, along with Butanal, leading to a total of four compounds that cannot give the iodoform reaction.

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