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Stereoisomerism

Which of the ...

Question

Which of the following compound(s) has/have ' $Z$ ' configuration?

(i) only

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(ii) only

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(iii) only

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(i) and (iii)

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Solution

The correct option is D (i) and (iii)
When the groups with higher priority (ie, with high atomic number) are present on same side of double bond, then the configuration is Z but when present on opposite side of double bond, the configuration is E.
(Priority: $B r > C I$ and $C H_{3} > H$ )
Hence, compound (i) and (iii) have (Z) configuration.

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