Which of the following is an E isomer? | vedclass

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(B) The $E/Z$ system of nomenclature is used to describe the configuration of alkenes. An isomer is $E$ (from the German 'entgegen',meaning opposite)

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(B) The $E/Z$ system of nomenclature is used to describe the configuration of alkenes. An isomer is $E$ (from the German 'entgegen',meaning opposite) if the high-priority groups are on opposite sides of the double bond. An isomer is $Z$ (from the German 'zusammen',meaning together) if the high-priority groups are on the same side of the double bond. By applying the Cahn-Ingold-Prelog $(CIP)$ priority rules to the substituents on the double-bonded carbons in the given structures,we determine the configuration. In structure $B$,the high-priority groups attached to each carbon of the $C=C$ double bond are located on opposite sides,thus it represents the $E$ isomer.

Which of the following is an $E$ isomer?

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