The reaction of acetone with triiodomethane is an example of a nucleophilic substitution reaction. In this type of reaction, a nucleophile (a species with a lone pair of electrons) attacks an electrophile (a species with a positive charge or an electron-deficient atom) and replaces a leaving group.

In the case of the reaction between acetone and triiodomethane, the nucleophile is the enolate ion of acetone, which is formed by the deprotonation of the alpha-carbon of acetone. The electrophile is the carbon atom of triiodomethane, which is electron-deficient due to the presence of the three iodine atoms. The leaving group is the iodide ion.

The reaction proceeds as follows:

1. The enolate ion of acetone attacks the carbon atom of triiodomethane.

2. The iodide ion is displaced and leaves the reaction mixture.

3. The product of the reaction is an iodoform, which is a compound with the formula CHI3.

The reaction between acetone and triiodomethane is a classic example of a nucleophilic substitution reaction and is often used as a teaching tool in organic chemistry courses.