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(B) The given reactant is $2,3$-dichlorobutane. When treated with zinc $(Zn)$ dust in the presence of heat $(\Delta)$,a dehalogenation reaction occurs

Vedclass · Accepted Answer

cis-But$-2-$ene

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(B) The given reactant is $2,3$-dichlorobutane. When treated with zinc $(Zn)$ dust in the presence of heat $(\Delta)$,a dehalogenation reaction occurs. This is a classic method for preparing alkenes from vicinal dihalides.The reaction is:$CH_3-CH(Cl)-CH(Cl)-CH_3 + Zn \xrightarrow{\Delta} CH_3-CH=CH-CH_3 + ZnCl_2$In the given Fischer projection,the two chlorine atoms are on the same side (erythro form). Elimination of $Cl_2$ from this specific stereoisomer leads to the formation of the cis-alkene.Therefore,the product $(P)$ is cis-but$-2-$ene.

The product $(P)$ of the following reaction is:

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