Which of the following shows geometrical isomerism ?
(i)CHCl=CHCl , (ii)`CH_2=C Cl_2` , (iii) `C Cl_2=CHCl`
Give structures of its cis- and trans-forms.

Explanation

To determine which of the given compounds shows geometrical isomerism, we need to analyze each compound based on the criteria for geometrical isomerism. The two main conditions for geometrical isomerism are:

1. There must be a double bond (C=C) or a restricted rotation (like in cyclic compounds).
2. Each carbon involved in the double bond must have two different groups attached to it.

Let's analyze each compound:

### Step 1: Analyze Compound (i) CHCl=CHCl
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