Dinitrobenzenes are chemical compounds composed of a benzene ring and two nitro group (-NO2) substituents. The three possible arrangements of the nitro groups afford three isomers, 1,2-dinitrobenzene, 1,3-dinitrobenzene, and 1,4-dinitrobenzene. Each isomer has the chemical formula C6H4N2O4 and a molar mass of about 168.11 g/mol. 1,3-Dinitrobenzene...
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http://en.wikipedia.org/wiki/Dinitrobenzene
any of three isomeric benzene derivatives having the formula CHNO, made by nitration of benzene or nitrobenzene, the most important of which is the meta form: used chiefly in the manufacture of dyes.
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https://www.infoplease.com/dictionary/dinitrobenzene
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