Determine the type of each of the arrows displayed in the following arrow-pushing mechanism.
![](https://lightcat-files.s3.amazonaws.com/problem_images/4c7730ef6832f610-1684940655741.jpg)
Type I: nucleophilic attack by a lone pair of electrons
Type II: heterolytic cleavage of a σ bond
Type III: nucleophilic attack by the π electrons
Type IV: dissociation of a π bond
Type V: formation of a π bond