benzyl alcohol in NaOH then added into HCl

When benzyl alcohol is added to sodium hydroxide (NaOH), it will undergo a nucleophilic substitution reaction to form sodium benzoate and water. The reaction can be represented as follows:

C6H5CH2OH + NaOH → C6H5COONa + H2O

Then, when sodium benzoate is added into hydrochloric acid (HCl), a neutralization reaction will occur to form benzoic acid and sodium chloride. The reaction can be represented as follows:

C6H5COONa + HCl → C6H5COOH + NaCl

In the end, the result of these two reactions is the conversion of benzyl alcohol to benzoic acid.