Which reaction is NOT a displacement reaction?

HCl + NaOH → NaCl + H2O is not a displacement reaction but a neutralization reaction. In this reaction, an acid (HCl) reacts with a base (NaOH) to form a salt (NaCl) and water (H2O). Unlike a single displacement reaction where one element replaces another, this involves an exchange of ions between two compounds. A standard displacement reaction occurs when a more reactive element takes the place of a less reactive element within a compound.