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This lecture explores fundamental topics in UV-Visible Spectroscopy. We will define chromophores and auxochromes, their roles in light absorption, and discuss examples like NO2, -OH, and -NH2. Key concepts such as bathochromic (red) and hypsochromic (blue) shifts, as well as intensity effects like hyperchromic and hypochromic changes, will be explained. Finally, we will examine applications, including functional group detection, structural analysis of conjugated systems, and their relevance...