JEE Main levelOne or more correct optionsDifficulty 2 of 3si045
Which of the following give a yellow precipitate of CHIX3 with NaOH/IX2? (more than one may be correct)
Aethanol
Bpropan-2-ol
Cbutan-2-one
Dpentan-3-one
Answer: A, B, C
The iodoform test needs CHX3COX− or CHX3CH(OH)X− (oxidised to CHX3COX− by hypoiodite). Propan-2-ol, butan-2-one and ethanol qualify. Pentan-3-one, CHX3CHX2COCHX2CHX3, has no methyl ketone unit.