Which of the following can show geometrical isomerism?
(i) Propene (ii) But-1-ene (iii) But-2-ene (iv) Pent-2-ene

Explanation

To determine which of the given compounds can show geometrical isomerism, we need to analyze each compound based on the criteria for geometrical isomerism. Geometrical isomerism occurs in alkenes when there are two different groups attached to each carbon of the double bond.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- (i) Propene (C3H6)
- (ii) But-1-ene (C4H8)
- (iii) But-2-ene (C4H8)
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