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Determination of Structure Give the structural formulas of compounds A, B, and C in the following problems. EXPLAIN EXACTLY HOW YOU ARRIVED AT EACH ANSWER. Compound A is a water-soluble liquid that gives positive 2,4- dinitrophenylhydrazine and iodoform tests and a negative Tollens test. The IR spectrum of A has bands at 2950, 1720 and 1370 cm1. The ¹H NMR spectrum consists of three signals: a quartet at 8 2.3, a singlet at & 2.0 and a triplet at 8 1.2. in a ratio of 2:3:3 respectively. Compound B is a liquid that is insoluble in water but soluble in 5% HCI. The 13c NMR spectrum of B consists of signals in the 8 100-160 region (DEPT indicates CH, CH, CH, CH and C and C) and another signal at 855 (DEPT indicates CH3). The IR spectrum of B has bands at 3410, 1600 and 1500 cm-1 but none at 1620-1680 cm-1. Compound C, molecular weight 118, is soluble in water to give a solution with a pH of 3. A 0.330-gram sample of C requires 27.9 mL of 0.200 M NaOH to reach the end point in a titration. The H NMR spectrum of C consists of the following signals: 8 Relative Area a Splitting singlet quartet 13.1 doublet HUD b с 3.6 1.8 113