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This sequence of reactions describes a common organic chemistry reduction process. Here's a breakdown:
1. NaBH4 (in EtOH): Sodium borohydride (NaBH4) is a reducing agent that is typically used in ethanol (EtOH) as a solvent. It selectively reduces aldehydes and ketones to their corresponding alcohols.
2. H3O+: The addition of aqueous acid (H3O+) is used to protonate the alkoxide intermediate formed in the first step, generating the final alcohol product.