The correct statements with respect to the ab | vedclass

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(B) The reaction of alkenes with $Br_2$ in $CCl_4$ involves anti-addition of bromine atoms across the double bond. This reaction is stereospecific. Fo

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$I$ and $III$

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(B) The reaction of alkenes with $Br_2$ in $CCl_4$ involves anti-addition of bromine atoms across the double bond. This reaction is stereospecific. For the cis-alkene $(P)$ (maleic acid),anti-addition yields the racemic mixture of the threo-isomer. For the trans-alkene $(Q)$ (fumaric acid),anti-addition yields the meso-compound,which is the erythro-isomer. Based on the provided structures: $(X)$ is the product of $(P)$,which is the threo-isomer. $(Y)$ is the product of $(Q)$,which is the erythro-isomer. Therefore,statement $(I)$ is correct (stereospecific reaction) and statement $(III)$ is correct ($(X)$ is threo and $(Y)$ is erythro). Thus,the correct option is $B$.

The correct statements with respect to the above pair of reactions are that:
$(I)$ The reactions are stereospecific.
$(II)$ $(X)$ is erythro and $(Y)$ is threo isomer.
$(III)$ $(X)$ is threo and $(Y)$ is erythro isomer.
$(IV)$ Each of $(P)$ and $(Q)$ gives a mixture of $(X)$ and $(Y)$.

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The correct statements with respect to the above pair of reactions are that: $(I)$ The reactions are stereospecific. $(II)$ $(X)$ is erythro and $(Y)$ is threo isomer. $(III)$ $(X)$ is threo and $(Y)$ is erythro isomer. $(IV)$ Each of $(P)$ and $(Q)$ gives a mixture of $(X)$ and $(Y)$.