Which reagent among the following is primarily used as an oxidizing agent for converting aldehydes to carboxylic acids?

The correct choice, Chromium Trioxide (CrO3), is an effective oxidizing agent that can convert aldehydes into carboxylic acids. In organic chemistry, the oxidation of aldehydes is often achieved using strong oxidizing agents to facilitate the transformation of the aldehyde functional group (-CHO) into the carboxylic acid functional group (-COOH). Chromium trioxide is particularly valuable in this context due to its high oxidation potential and ability to selectively oxidize aldehydes without affecting other functional groups that may be present.

In the context of the other reagents listed, Sodium Borohydride (NaBH4) and Lithium Aluminum Hydride (LiAlH4) are reducing agents rather than oxidizing agents. They are typically used to reduce aldehydes to primary alcohols rather than oxidize them to carboxylic acids.

Hydrogen Peroxide (H2O2), while it can act as an oxidizing agent, is not as commonly used for the specific conversion of aldehydes to carboxylic acids as Chromium Trioxide. The strength and specificity of CrO3 make it the preferred choice for this oxidation reaction, especially in laboratory settings. Thus, Chromium Trioxide is the reagent