4-Chlorobenzaldehyde is also known as 4-chlorobenzaldehyde, with a molecular formula of C7H5ClO and a molecular weight of 140.567. This substance is mainly used in the manufacture of sedatives such as fenalol and aminophenolic acid and other pharmaceutical raw materials and intermediates. It is used in the manufacture of chlorocinnamon Aldehydes, weeding and killing enemies, etc.