Propanone, $$\(\mathrm{CH}_{3} \mathrm{COCH}_{3}\)$$, is an important organic reagent. Fig. 4.1 shows some reactions of propanone and its derivatives. Fig. 4.1 （f）Compounds A，B and C can be distinguished using infrared spectroscopy． B CC(C)(O)C(=O)O Fig． 4.3 shows the infrared spectrum of one of the compounds． Fig． 4.3 Table 4.1 (i) Explain why the absorptions at $$\(2850-2950 \mathrm{~cm}^{-1}\)$$ are not useful to help determine which of the compounds $$\(\mathbf{A}, \mathbf{B}\)$$ or $$\(\mathbf{C}\)$$ produces the infrared spectrum in Fig. 4.3. Use Table 4.1 to answer this question. ....................................................................................................................................... . ................................................................................................................................. (ii) Identify which of compounds $$\(\mathbf{A}, \mathbf{B}\)$$ or $$\(\mathbf{C}\)$$ produces the infrared spectrum in Fig. 4.3. Explain your answer. compound .......................... explanation .................................................................................................................... ....................................................................................................................................... . ....................................................................................................................................... .

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