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Select the BEST description for each event in the mechanism for the imine formation reaction depicted below.

Answer based on what happens to the magenta structure.

Step 1 is best described as:
Select Option ProtonationDeprotonationNucleophilic Addition to a $C=O$ groupNucleophilic Substitution (e.g. $S_N2$ reaction)EliminationSelf-Neutralization
.
Step 2 is best described as:
Select Option ProtonationDeprotonationNucleophilic Addition to a $C=O$ groupNucleophilic Substitution (e.g. $S_N2$ reaction)EliminationSelf-Neutralization
.
Step 3 is best described as:
Select Option ProtonationDeprotonationNucleophilic Addition to a $C=O$ groupNucleophilic Substitution (e.g. $S_N2$ reaction)EliminationSelf-Neutralization
.
Step 4 is best described as:
Select Option ProtonationDeprotonationNucleophilic Addition to a $C=O$ groupNucleophilic Substitution (e.g. $S_N2$ reaction)EliminationSelf-Neutralization
.
Step 5 is bext described as:
Select Option ProtonationDeprotonationNucleophilic Addition to a $C=O$ groupNucleophilic Substitution (e.g. $S_N2$ reaction)EliminationSelf-Neutralization
.
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