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(B) The starting material is $butan-2-ol$. Upon acid-catalyzed dehydration $(H^+/\Delta)$,it forms three isomeric alkenes: $but-1-ene$,$cis-but-2-ene$

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$3, 5$

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(B) The starting material is $butan-2-ol$. Upon acid-catalyzed dehydration $(H^+/\Delta)$,it forms three isomeric alkenes: $but-1-ene$,$cis-but-2-ene$,and $trans-but-2-ene$. Thus,$x = 3$.When these three alkenes react with $Br_2/CCl_4$ (anti-addition):$1$. $but-1-ene$ gives a racemic mixture of two enantiomers ($2$ products).$2$. $cis-but-2-ene$ gives a racemic mixture of two enantiomers ($2$ products).$3$. $trans-but-2-ene$ gives a meso compound ($1$ product).Total number of stereoisomeric products $y = 2 + 2 + 1 = 5$.

The number of possible products for $x$ and $y$ is

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