68. Solving a chemistry problem
149. Get the following compounds from benzene (pay attention to the sequence of substitution reactions): o-, m-, n-nitrotoluenes; 2,5-dichloronitrobenzene; 2-nitro-5-aminophenol; 3-nitro-5-bromophenol; o-, m-, p-nitrobenzoic acids; 2-bromo-4-nitroaniline.
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