Which of the following will exhibit cis-trans isomerism?

{C H}_{2} B r - {C H}_{2} B r

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C B r_{3} - {C H}_{3}

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C H B r = C H B r

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C {B r}_{2} = {C H}_{2}

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Solution

The correct option is B $C H B r = C H B r$
Due to restricted rotation about double bond, the alkene shows geometrical isomerism because the relative position of atoms or groups attached to the carbon atoms of the double bond get fixed. If same group or atom attached with double bond bearing carbon, then alkene doesn't show geometrical isomerism.

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