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- Coumarin, a naturally occurring compound isolated from lavender, sweet clover, and tonka bean, is made in the laboratory from o hydroxybenzaldehyde by the reaction depicted below. Draw a stepwise mechanism for this reaction. Coumarin derivatives are useful synthetic anticoagulants.complete the following synthesesDetermine and draw the structure of compound A. Then, determine the reactant/reagent needed to accomplish the one step transformation from benzene to A. Br₂ FeBr3 H (acid workup) PCC A ?