Final answer:
Option D: The reaction NaOH + HCl → NaCl + H₂O involves the combination of H+ and OH- to form water and is a type of acid-base reaction.
Step-by-step explanation:
Among the chemical reactions listed, d. NaOH + HCl → NaCl + H₂O is the one that clearly illustrates a transfer of electrons, which is characteristic of a type of reaction known as an acid-base reaction or neutralization. However, redox (reduction-oxidation) reactions are typically associated with the actual transfer of electrons. It does involve interactions at the electron level to form a covalent bond in water, but not a transfer of electrons as seen in typical redox reactions.
In this case, each of the reactants loses or gains protons (H+ ions), rather than electrons, as they form water and sodium chloride. If we look closely at the individual ions involved, we could say that the H+ ion from HCl and the OH- ion from NaOH combine to form water, which could be misinterpreted as electron transfer, but it is actually the sharing of an electron pair to form a covalent bond in H₂O. Nonetheless, this is not the classic transfer of electrons as in redox reactions. The other given reactions are more about rearrangement of atoms without the clear transfer of electrons typical of redox processes.