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Which of the following compounds can be distinguished from iodoform test?

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in Chemistry – Class 12 by (188k points)
Which of the following compounds can be distinguished from iodoform test?

(a) Benzaldehyde and benzophenone

(b) Benzaldehyde and formaldehyde

(c) Acetophenone and acetaldehyde

(d) Acetophenone and benzophenone

The question was asked in a job interview.

This intriguing question originated from Aldehydes and Ketones Chemical Reactions topic in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Right option is (d) Acetophenone and benzophenone

To explain I would say: Iodoform test involves the reaction of a compound with sodium hypoiodite to detect the presence of CH3CO or CH3CH(OH) group. A positive test forms CHI3 (iodoform) in the form of a yellow precipitate. Acetaldehyde and acetophenone give yellow ppt in this test, whereas formaldehyde, benzophenone and benzaldehyde do not undergo this test due to the absence of CH3CO group in their structures.

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