Complete Fig. 4.2 to show how 1,2-dibromoethane is formed in reaction 1. Include charges, dipoles, lone pairs of electrons and curly arrows as appropriate.
For reaction 1, $\\Delta H_r$ is $-90.0\\,\\text{kJ mol}^{-1}$. For ethene, $\\Delta H_f$ is $+52.2\\,\\text{kJ mol}^{-1}$. Calculate the enthalpy change of formation of 1,2-dibromoethane.
Complete Fig. 4.1 by drawing the structure of compound A and giving the name of compound B.
Draw one repeat unit of polymer C in the box.
In reaction 5, compound B reacts with an excess of NaOH dissolved in ethanol. The products are HBr, H$_2$O and an unsaturated hydrocarbon D. Suggest the identity of D.
Compound E is the sole isomer of 1,2-dibromoethane. Identify the type of isomerism shown by E and 1,2-dibromoethane.
Name the homologous series to which F belongs.
Complete Table 4.1 to state the observations when F reacts with the reagents listed: 2,4-dinitrophenylhydrazine (2,4-DNPH reagent), Tollens’ reagent, and alkaline I$_2$(aq).
H also has a molecular ion peak at $m/e = 60$ in its mass spectrum. Use the information in (e), Fig. 4.3 and Table 4.2 to deduce the structure of H. Explain your answer fully.
Suggest the function of reagent G.