Benzaldehyde (\(\text{C}_6\text{H}_5\text{CHO}\)) can be converted to benzophenone (\(\text{C}_6\text{H}_5\text{COC}_6\text{H}_5\)) using a Friedel-Crafts acylation reaction. In this reaction, benzaldehyde is treated with phenyl acetyl chloride in the presence of a Lewis acid catalyst such as AlCl\(_3\). The acyl group is added to the benzene ring, resulting in the formation of benzophenone.