Rank the following compounds in order of decr | vedclass

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(B) In an $E_2$ reaction,anti-periplanar elimination is required,meaning the leaving group $(-Br)$ and the $\beta$-hydrogen must be anti to each other

Vedclass · Accepted Answer

$c > a > b$

Vedclass · Answer

(B) In an $E_2$ reaction,anti-periplanar elimination is required,meaning the leaving group $(-Br)$ and the $\beta$-hydrogen must be anti to each other. In compound $(c)$,the $-Br$ is equatorial and the $\beta$-hydrogens are axial,allowing for an anti-periplanar conformation. In compound $(a)$,the $-Br$ is axial,but the adjacent $\beta$-hydrogen is not perfectly anti-periplanar due to the methyl group orientation,making it slower than $(c)$. In compound $(b)$,the $-Br$ and the adjacent methyl group are both axial (cis-like),which hinders the approach of the base and prevents the necessary anti-periplanar geometry for the $\beta$-hydrogen,making it the least reactive. Thus,the order of reactivity is $c > a > b$.

Rank the following compounds in order of decreasing rate of $E_2$ reaction.

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