Which of the following does not give yellow ppt on iodoform test?(a) Propan-2-ol(b) Butan-2-ol(c) Pentan-2-one(d) Pentan-3-oneThe question was posed to me in an interview for job.Question is from Aldehydes and Ketones Chemical Reactions topic in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Which of the following does not give yellow ppt on iodoform test?(a) P

1.	Which of the following does not give yellow ppt on iodoform test?(a) Propan-2-ol(b) Butan-2-ol(c) Pentan-2-one(d) Pentan-3-oneThe question was posed to me in an interview for job.Question is from Aldehydes and Ketones Chemical Reactions topic in division Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12
Answer» Correct option is (d) Pentan-3-one Easiest explanation: Pentan-2-one consists of a CH3CO groups and gives POSITIVE for IODOFORM test. Propan-2-ol and butan-2-ol pass iodoform test because of the PRESENCE of CH3CH(OH) group which gets oxidised to CH3O group during reaction. On the other hand, pentan-3-one consists of only ethyl groups on either side of the carbonyl carbon and is not oxidised by SODIUM hypoiodite to give iodoform.

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