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(B) The dehydration of butan$-2-$ol with $H^+/H_2O$ (acid-catalyzed dehydration) yields a mixture of alkenes $(X)$.Butan$-2-$ol $\xrightarrow{H^+}$ bu

Vedclass · Accepted Answer

$3$

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(B) The dehydration of butan$-2-$ol with $H^+/H_2O$ (acid-catalyzed dehydration) yields a mixture of alkenes $(X)$.Butan$-2-$ol $\xrightarrow{H^+}$ but$-1-$ene + but$-2-$ene (cis and trans).Thus,the mixture $X$ consists of $3$ alkenes: but$-1-$ene,cis-but$-2-$ene,and trans-but$-2-$ene.When these react with $Br_2$:$1$. But$-1-$ene gives $1,2$-dibromobutane (one chiral center,$2$ enantiomers).$2$. Cis-but$-2-$ene gives meso-$2,3$-dibromobutane ($1$ isomer).$3$. Trans-but$-2-$ene gives a racemic mixture of $(2R,3R)$- and $(2S,3S)$-$2,3$-dibromobutane ($2$ enantiomers).Total isomers = $2 + 1 + 2 = 5$ isomers of $C_4H_8Br_2$.Therefore,the number of alkenes $X$ is $3$.

For the given reaction,if the final product is a mixture of $C_4H_8Br_2$ isomers,what is the value of $X$ (the number of alkenes formed in the mixture)?

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