Which of the following compounds shows geometrical isomerism ?
(i) Pent-1-ene
(ii) 2-Methylbut-2-ene
(iii) Pent-2-ene

Explanation

To determine which of the given compounds shows geometrical isomerism, we need to analyze each compound based on the presence of a double bond and the arrangement of substituents around that double bond. Geometrical isomerism (cis-trans isomerism) occurs when there are two different groups attached to each carbon of the double bond.

### Step-by-Step Solution:

1. **Analyze Pent-1-ene:**
- Structure: CH2=CH-CH2-CH2-CH3
- The double bond is between the first and second carbon atoms.
- Since one of the carbons in the double bond (C1) has two hydrogen atoms attached (CH2), it does not have different substituents on both sides of the double bond.
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