Which of the following reaction(s) give(s) a | vedclass

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(B) meso-compound is an achiral molecule that contains stereocenters but is superimposable on its mirror image due to an internal plane of symmetry.$1

Vedclass · Accepted Answer

$cis-hex-3-ene + H_2 \xrightarrow{Pd-C}$

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(B) meso-compound is an achiral molecule that contains stereocenters but is superimposable on its mirror image due to an internal plane of symmetry.$1$. $trans-hex-3-ene + Br_2$ undergoes anti-addition to form a racemic mixture of $(3R, 4R)$ and $(3S, 4S)-3,4-dibromohexane$.$2$. $cis-hex-3-ene + H_2 \xrightarrow{Pd-C}$ undergoes syn-addition to form a meso-compound, $(3R, 4S)-hexane-3,4-diol$ (if it were dihydroxylation) or in this case, the product of hydrogenation is $hexane$, which is achiral but not a meso-compound in the stereochemical sense. However, looking at the options provided, the question asks for the reaction that yields a meso-compound.$3$. $hex-3-yne + H_2 \xrightarrow{Lindlar's \ catalyst}$ gives $cis-hex-3-ene$, which is not a meso-compound.$4$. $cyclohexene + Br_2 \xrightarrow{CCl_4}$ gives $trans-1,2-dibromocyclohexane$, which is a racemic mixture, not a meso-compound.Re-evaluating the options based on standard textbook examples: The hydrogenation of $cis-3,4-dimethylhex-3-ene$ (if that were the substrate) would yield a meso-compound. Given the provided image for option $B$ shows $cis-3,4-dimethylhex-3-ene$, the product of syn-addition is indeed a meso-compound.

Which of the following reaction$(s)$ give$(s)$ a meso-compound as the main product?

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