Which of the following alkenes will show geometrical isomerism ?
(i) Propene, (ii) But-2-ene , (iii) But-1-ene , (iv) 2, 3-Dimethylbut-2-ene

Explanation

To determine which of the given alkenes will show geometrical isomerism, we need to analyze each compound based on the conditions necessary for geometrical isomerism to occur. Geometrical isomerism (also known as cis-trans isomerism) occurs in alkenes when there is restricted rotation around the double bond, and the substituents attached to the double-bonded carbons are different.

### Step-by-Step Solution:

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