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NEET levelSingle correct optionDifficulty 1 of 3st250

The compound shown is 1-bromo-2-chloroethene drawn with $Br$ and $Cl$ on the same side of the double bond. Its configuration is

A $(Z)$
B $(E)$
C $(S)$
Dit has no geometrical isomers

Answer: A

On C1 the groups are

Br

and

H

;

Br

has priority. On C2 the groups are

Cl

and

H

;

Cl

has priority. The two higher-priority groups

Br

and

Cl

are on the same side of the double bond, so the compound shown is the

(Z)

isomer.

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