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Sublimation - Purification of organic compounds
Specific organic solids on heating directly change from solid to vapour state without passing via a liquid state, such types of substances are known as sublimable and this procedure is called sublimation. The sublimation process is employed for the separation of sublimable volatile compounds from non sublimable impurities. The process is usually employed for the purification of camphor, anthracene, naphthalene, benzoic acid NH4Cl,HgCl2, solid SO2, Iodine and salicylic acid etc containing non-volatile impurities.
Ortho, meta and para 1. Ortho (or 1, 2-) : if the two substituents are on the adjacent carbon atoms, the compound is said to be ortho (or 1, 2-). 2. Meta (or 1, 3-) : if the
basic structure
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Characteristic flame colour: specific metals and their salts impart particular colours to Bunsen burner flame. (1) Pb (plumbum) impart pale greenish colour to the f
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