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JEE Main20236 Apr 2023Evening ShiftChemistryAldehydes and KetonesActual

Among the following the number of compounds which will give positive iodoform reaction is _____. (a) 1 -Phenylbutan- 2 -one (b) 2 -Methylbutan- 2 -ol (c) 3 -Methylbutan- 2 -ol (d) 1 -Phenylethanol (e) 3 , 3 -dimethylbutan- 2 -one (f) 1 -Phenylpropan- 2 -ol

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Step-by-step solution

Iodoform test is used to check the presence of carbonyl compounds with the structure R - CO - CH 3 or alcohols with the structure R - CH ( OH ) - CH 3 in a given unknown substance. The reaction of iodine, a base and a methyl ketone gives a yellow precipitate along with an “antiseptic” smell. Hence, (c), (d), (e) and (f) give iodoform reaction

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