The iodoform test is used to detect the presence of acyl groups in the given compound. ... We can see that acetaldehyde has an acyl group whereas benzaldehyde does not. Thus, the test will give a positive result for acetaldehyde and a negative result for benzaldehyde.

Which aldehyde does not give iodoform test?

Isobutanal does not give iodoform test.

Which aldehydes give iodoform test?

Ethanal is the only aldehyde to give the triiodomethane (iodoform) reaction. If "R"is a hydrocarbon group, then you have a ketone. Lots of ketones give this reaction, but those that do all have a methyl group on one side of the carbon-oxygen double bond.