REACTIONS AND IDENTIFICATION 385 (B) NITRO-PHENOLS. o- and p-Nitrophenols. (C) NITRO-ANILINES, o-, m- and p-Nitro-amlines. A) NITRO-HYDROCARBONS. Physical Properties. Nitrobenzene, C 6 H 5 NO 2 , pale yellow liquid, insoluble in and heavier than water, characteristic odour of bitter almonds, (similar to that of benzaldehyde and benzonitrile). p-Nitro-toluene, C 6 H 4 (CH 3 )NO 2 , usually pale yellow solid, insoluble in water. m-Dinitrobenzene, C 6 H 4 (NO 2 ) 2 , colourless solid when pure, but often pale yellow: insoluble in water. GENERAL REACTION. Reduced in acid solutions to primary amines. Place about i g. of the nitro-hydrocarbon in a boiling-tube and add 5 ml. of cone. HCl and several pieces of granulated tin. Warm the mixture and shake continuously to break up the oily drops of the nitro-compound. When all the oil has disappeared (about 3 minutes' heating) pour off the liquid from any undissolved tin into a ioo ml. conical flask. Cool and add cautiously 30% aqueous NaOH solution
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