Discussion
Which of the following undergoes haloform reaction?
Answer: D
The compound that gives the haloform reaction is propanone.
The haloform reaction is given by methyl ketones and other compounds with a CH3CO- group (or CH3CH(OH)- that is oxidised to it). Propanone, CH3COCH3, has this group and gives iodoform with iodine and alkali.
Benzophenone, methanal, propanal (CH3CH2CHO) and 2,2-dimethylpropanal have no CH3CO- group, so none of them gives the test. Ethanal is the only aldehyde that does.
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