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(A) The reaction shown is the syn-dihydroxylation of $cis-2-butene$ using $OsO_4$ as a catalyst.Syn-addition of $OH$ groups to $cis-2-butene$ results

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(A) The reaction shown is the syn-dihydroxylation of $cis-2-butene$ using $OsO_4$ as a catalyst.Syn-addition of $OH$ groups to $cis-2-butene$ results in the formation of a meso compound.Structure $1$ represents the meso-butane$-2,3-$diol,which is the achiral product formed due to the internal plane of symmetry.Structures $2$ and $3$ are enantiomers of each other,which would be formed if the addition were anti.Therefore,the correct product is only $1$.

What is the product of the following reaction?

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