Bromoalkanes are used widely in industry, although there is increasing concern about their environmental impact. Fig. 4.1 shows a reaction scheme involving 1,2-dibromoethane. Fig. 4.1 （e）Compound $$\(\mathbf{F}\)$$ reacts with reagent $$\(\mathbf{G}\)$$ to form compound $$\(\mathbf{H}\)$$ ． The infrared spectrum of $$\(\mathbf{H}\)$$ is shown in Fig．4．3． Fig． 4.3 Table 4.2 H also shows a molecular ion peak at $$\(m / e=60\)$$ in its mass spectrum. (i) Use the information in (e), Fig. 4.3 and Table 4.2 to deduce the structure of H. Explain your answer fully. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . (ii) Suggest the role of reagent $$\(\mathbf{G}\)$$. ....................................................................................................................................... . Important values, constants and standards \begin{tabular}{|l|l|} \hline molar gas constant & $$\(R=8.31 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}\)$$ \\ \hline Faraday constant & $$\(F=9.65 \times 10^{4} \mathrm{C} \mathrm{mol}^{-1}\)$$ \\ \hline Avogadro constant & $$\(L=6.022 \times 10^{23} \mathrm{~mol}^{-1}\)$$ \\ \hline electronic charge & $$\(e=-1.60 \times 10^{-19} \mathrm{C}\)$$ \\ \hline molar volume of gas & \begin{tabular}{l} $$\(V_{\mathrm{m}}=22.4 \mathrm{dm}^{3} \mathrm{~mol}^{-1} \mathrm{s.t.p}.(101 \mathrm{kPa}\)$$ and 273 K$$\()\)$$ \\ $$\(V_{\mathrm{m}}=24.0 \mathrm{dm}^{3} \mathrm{~mol}^{-1}\)$$ at room conditions \end{tabular} \\ \hline ionic product of water & $$\(K_{\mathrm{w}}=1.00 \times 10^{-14} \mathrm{~mol}^{2} \mathrm{dm}^{-6}\left(\right.\)$$ at $$\(\left.298 \mathrm{~K}\left(25^{\circ} \mathrm{C}\right)\right)\)$$ \\ \hline specific heat capacity of water & $$\(c=4.18 \mathrm{~kJ} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}\left(4.18 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1}\right)\)$$ \\ \hline \end{tabular}

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