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Benzene and ethylbenzene are both common organic compounds with different structures, resulting in differences in the reagents used in the laboratory. Benzene is a colorless and transparent liquid with an aromatic taste, widely used in organic synthesis and solvent applications. Ethylbenzene is also a colorless liquid with a distinct aromatic odor, and can be used in paint, cleaning agents, and plastics. From a chemical structure perspective, benzene is an aromatic hydrocarbon composed of six carbon atoms and six hydrogen atoms, while ethylbenzene is formed by adding a methyl group to benzene. This structural difference results in some differences in properties between the two. In the laboratory, benzene and ethylbenzene often require the use of reagents for reaction or purification. So, how should we choose reagents suitable for benzene or ethylbenzene? For benzene, commonly used reagents include bromine water, potassium permanganate, silver nitrate, etc. These reagents can be used for the halogenation and oxidation reactions of benzene, as well as for the detection of functional groups such as ketones and alcohols. For ethylbenzene, commonly used reagents include nitric acid, ferric chloride, etc., which can be used for the nitration reaction of ethylbenzene and the detection of methyl groups. When selecting reagents, it is also necessary to consider the purity and stability of the reagents, as well as the degree of matching with reaction conditions. For example, some reagents may be sensitive to air or light, and special attention should be paid to storage conditions when using them. In addition, it is also very important to store and dispose of reagents properly. The reagents should be stored in a dry and cool place, avoiding high temperatures and direct sunlight, while also avoiding mixing and cross contamination of the reagents. When discarding reagents, they should be classified and disposed of according to relevant regulations to protect the environment and personal safety. In general, understanding the characteristics of benzene and ethylbenzene and selecting suitable reagents are important factors in ensuring the smooth progress and accurate results of experiments.