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The balanced chemical equation for the reduction of benzil with sodium borohydride (NaBH4) in water is:
2 C14H10O2 + NaBH4 + 2 H2O → 2 C14H12O2 + NaBO2 + 4 H2
Benzil (C14H10O2) is reduced to hydrobenzoin (C14H12O2) by sodium borohydride, which acts as a reducing agent. Water is also involved in the reaction, and sodium borate (NaBO2) and hydrogen gas (H2) are produced as byproducts.