Question

The compound which does not undergo haloform reaction is

Answer 1

alcohols: in case of primary alcohols only ethanol can give haloform test other primary alcohols do not. In alcohols beta carbon must be methyl group.

Answer 2

The haloform reaction is the reaction of a methyl ketone with chlorine, bromine, or iodine in the presence of hydroxide ions to give a carboxylate ion and a haloform.

If you are trying to identify a compound, from a list, which does or does not undergo the reaction, you need to identify the methyl ketones and look for the R–CO–CH3 grouping.