Final answer:
PCC (Pyridinium chlorochromate) is the correct reagent for converting 2,2-dimethylbutan-1-ol into 2,2-dimethylbutanal as it is a mild oxidizing agent that prevents over-oxidation.
Step-by-step explanation:
The reagent that can be used to convert 2,2-dimethylbutan-1-ol into 2,2-dimethylbutanal is PCC (Pyridinium chlorochromate). PCC is a mild oxidizing agent that is ideal for converting primary alcohols to aldehydes without further oxidation to carboxylic acids. The other reagents listed like H2CrO4 (Chromic acid), KMnO4 (Potassium permanganate), and O3 (Ozone) are too strong and will likely over-oxidize the alcohol to the corresponding carboxylic acid. In contrast, LiAlH4 (Lithium aluminum hydride) is a reducing agent, which would not oxidize an alcohol but reduce carbonyl compounds.