Which of the following steps would you expect to occur in the addition reaction mechanism?
I. Electrophilic attack on the unsaturated bond
II. Formation of carboanion
III. Formation of carbocation
IV. Nucleophilic attack on the carbocation
V. Elimination of a base

Question

Which of the following steps would you expect to occur in the addition reaction mechanism? 
I. Electrophilic attack on the unsaturated bond
II. Formation of carboanion
III. Formation of carbocation
IV. Nucleophilic attack on the carbocation
V. Elimination of a base

Quizplus · Accepted Answer

The addition reaction mechanism typically involves electrophilic attack by a reagent such as a proton or an electrophilic molecule on the unsaturated bond. This leads to the formation of a carbocation intermediate. In some cases, a carboanion may also form before a carbocation. The carbocation is then subject to nucleophilic attack, which adds a nucleophile to the molecule. Finally, if an acidic hydrogen is present, a base may be eliminated to form a neutral product. Therefore, steps I, III, and IV are all involved in the addition reaction mechanism. Steps II and V are not typically involved in this mechanism.

Which of the Following Steps Would You Expect to Occur