Which of the following reagents will convert isobutyraldehyde to the corresponding acid?
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Oxidation of aldehydes generally leads to carboxylic acids, and reagents like nitric acid or silver-ammonia complexes are commonly used for this purpose.
In the given options, HNO$_3$ (Nitric acid) and 2[Ag(NH$_3$)$_2$]⁺ are reagents that can oxidize isobutyraldehyde into its corresponding carboxylic acid. The third option is also a known reagent for this transformation.