Question

Does Butanal give an iodoform test?

Answer 1

Hint: We know that Iodoform test is utilized to check the presence of carbonyl mixtures with the design \[R - CO - C{H_3}\] or alcohols with the construction \[R - CH\left( {OH} \right) - C{H_3}\] in a given obscure substance. The response of iodine, a base and a methyl ketone gives a yellow acceleration alongside a "clean" smell. It likewise tests positive for a couple of explicit auxiliary alcohols that contain at any rate one methyl bunch in the alpha position.

Complete answer:
No, butanal doesn't give a positive iodoform test. The solitary aldehyde that gives a positive iodoform test is acetaldehyde.

Additional information:
Now we discuss about mechanism of Iodoform test:
In the first place, the Hydroxide particle eliminates acidic alpha hydrogen. These outcomes in the arrangement of an enolate particle. The enolate anion then, at that point proceeds to uproot an iodide particle from the iodine atom. This interaction rehashes twice to give\[R - CO - C{I_3}\]. Presently, a hydroxide particle shapes a bond with the carbonyl carbon. This prompts the renewal of the carbonyl gathering and the disposal of the \[C{I_3}^-\] anion. \[AR - COOH\] bunch is likewise framed. The carboxylic corrosive gathering and the essential \[C{I_3}^-\]particle kill one another. Along these lines the iodoform is hastened.

Note:
Let’s we see the description of iodoform test,
At the point when Iodine and sodium hydroxide are added to a compound that contains either a methyl ketone or an optional liquor with a methyl bunch in the alpha position, a light yellow hasten of iodoform or triiodomethane is shaped. It very well may be utilized to distinguish aldehydes or ketones. In the event that an aldehyde gives a positive iodoform test, it should be acetaldehyde since it is the solitary aldehyde with a \[C{H_3}C = O\] bunch. Given underneath are a couple of model responses for positive iodoform tests.