REACTIONS AND IDENTIFICATION 347 SPECIAL REACTIONS. Cyclohexanone. This is readily oxidised by a K 2 Cr 2 O 7-H 2 SO 4 mixture to the crystalline adipic acid, m.p. 152°, precisely as for cyclohexanol (p. 335). Benzophenone. To 0-5 g. of benzophenone add i g. of naphthalene (as a solvent) and heat until completely molten. Add a small piece of sodium and heat again. The surface of the sodium becomes green, and the colour [which is that of the • free radical, (C 8 Hj) 2 C-ONa] spreads throughout the molten mass on strong heating. Section 14. (A) CarboxylicAcids. — COOH. ( c /. Tables, pp. 543-545) (B) Sulphonic Acids.-SO 2 OH. ( c /. Table XIV, p. 548) (A) CARBOXYLIC ACIDS. Formic, acetic, oxalic, sucrinic, lactic, tartaric, citric; benzoic, salicylic (and other substituted benzoic acids); phthalic and cinnamic acids. Physical properties. All are colourless crystalline solids except formic acid, acetic acid (m.p. 18° when glacial) and lactic acid (m.p. 18°, usually a syrup). Formic acid (b.p. 100°) and acetic acid (b.p. 118°)
This is the end of the preview. Sign up
access the rest of the document.