The difference in photochemical behavior between left-handed levorotatory and right-handed dextrorotatory chiral molecules is due to their distinct spatial arrangements, which can lead to different interactions with light. Chiral molecules are non-superimposable mirror images of each other, also known as enantiomers. These enantiomers can have different photochemical properties, such as absorption and emission spectra, reaction rates, and product selectivity.One example of chiral molecules is limonene, a compound found in citrus fruits. The left-handed enantiomer, - -limonene, has a lemon scent, while the right-handed enantiomer, + -limonene, has an orange scent. The photochemical properties of these enantiomers differ due to their distinct spatial arrangements, which can affect their absorption of light and subsequent reactions.Another example is the amino acid alanine. L-alanine and D-alanine are enantiomers, with L-alanine being the naturally occurring form in proteins. The photochemical properties of these enantiomers can differ, as their distinct spatial arrangements can lead to different interactions with light and other molecules.In comparison to achiral molecules, chiral molecules can exhibit unique photochemical properties due to their enantiomeric forms. Achiral molecules do not have enantiomers, so their photochemical behavior is not influenced by chirality. For example, benzene is an achiral molecule, and its photochemical properties are not affected by the presence or absence of chirality.In summary, the photochemical behavior of left-handed and right-handed chiral molecules can differ due to their distinct spatial arrangements, which can lead to different interactions with light and other molecules. This can result in differences in absorption and emission spectra, reaction rates, and product selectivity. In contrast, achiral molecules do not exhibit such differences in photochemical properties, as they do not have enantiomers.