4. Consider compound 'Z' shown on the right:CCH3CO2O2CH3Ca) Reaction of the dicarboxylate salt 'Z' with bromine water (Br2in H2O) yielded two majormonobromo products, 'D' and 'E'. Compound 'D' has 2 elements of unsaturation; compound'E' has 3 elements of unsaturation.Propose possible structures for 'D' and 'E' (each has several stereoisomeric forms - you only need show one form for each, as long as it's a stereoisomer that could actually form) AND in each case, provide a step-by-step mechanism for the process in question. Make sure yourmechanism includes all significant intermediates which affect the outcome of the reaction.
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