Which one of the following shows geometrical isomerism : $C H C l = C H C l, C H_{2} = C C l_{2}, a n d C C l_{2} = C H C l .$

C H C l = C H C l

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C H_{2} = C C l_{2}

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C C l_{2} = C H C l

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None of the above

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Solution

The correct option is A $C H C l = C H C l$
Condition to show geometrical isomerism : $X Y C = C X Y$
X and Y must have different groups/atoms attached to carbon on the same side of double bond.
Among given compounds, only $C H C l = C H C l$ shows geometrical isomerism.
Other two have identical atoms on the same side of double bond; therefore, they can not show cis-trans isomerism.

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