Which of the following reactants is used to o | vedclass

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(A) The reaction involves an $E_2$ elimination mechanism using a strong base,$EtO^-$. For an $E_2$ elimination to occur,the leaving group (in this cas

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(A) The reaction involves an $E_2$ elimination mechanism using a strong base,$EtO^-$. For an $E_2$ elimination to occur,the leaving group (in this case,$Br$) and the $\beta$-hydrogen atom must be in an anti-periplanar (trans-diaxial) orientation to each other. Therefore,the reactant that allows for this specific geometric arrangement will successfully yield the product $(A)$.

Which of the following reactants is used to obtain the compound $(A)$ shown below? (Assume that $EtO^{-}$ is used in all the reactions)

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