The mechanism of the nucleophilic substitution reaction of benzylamine with ethyl iodide in the presence of a strong base involves the following steps:1. Deprotonation of benzylamine: The strong base e.g., NaOH or KOH abstracts the acidic hydrogen from the amine group of benzylamine, forming an amine anion benzylamide anion and a water molecule.Benzylamine + OH Benzylamide anion + HO2. Nucleophilic attack: The benzylamide anion, which is a strong nucleophile, attacks the electrophilic carbon atom of ethyl iodide, displacing the iodide ion as a leaving group.Benzylamide anion + Ethyl iodide N-benzylethylamine + I3. Overall reaction: The overall reaction is the formation of N-benzylethylamine from benzylamine and ethyl iodide in the presence of a strong base.Benzylamine + Ethyl iodide + OH N-benzylethylamine + I + HOThis reaction is an example of an S_N2 bimolecular nucleophilic substitution mechanism, where the nucleophile attacks the substrate in a single concerted step, leading to the inversion of stereochemistry at the electrophilic carbon center.