Question

ideofom test is given by​

Answer 1

hey mate, here's your answer....

Any compound containing the CH3C=O group or the CH3CH(OH)group gives a positive result with the iodoform test. When I2 and NaOH is added to a compound containing one of these groups, a pale yellow precipitate of iodoform(triiodomethane) is formed.

The iodoform test can therefore be used to identify aldehydes and ketones; is the compound is an aldehyde then it must be ethanal (this is the only aldehyde with the CH3C=O group). This occurs as three I atoms replace the H atoms of CH3C=OR, and the C-C bond breaks due to the electron withdrawing effect of the three I atoms (as I is more electronegative than C) forming CHI3 and the salt anion of a carboxylic acid (depending on the R group of the original compound, which influences the length of the carbon chain of the anion RCOO- that is formed).

...hope this helps...