AlCl3-CH3Cl is the right response, 1) 2) HNO3 and H2SO4 at ambient temperature 3) HNO3-H2SO4 fuming at temperatures of 90–100 0 C. I believe that benzene is being converted in this process to 2,4,6-trinitrotoluene.
A reagent is a chemical or combination that is used to determine if another material is present or absent, typically by observing a change in color, or to calculate the concentration of a substance.
In the field of chemical chemistry, a reagent is defined as "a material or compound given to a system in order to bring about a chemical reaction or is added to verify whether a reaction has happened or not." The presence of another chemical can be detected and confirmed using a response like this.
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