Which of the following does possess acidic character?
(i) Butane (ii) But-1-ene (iii) But-1-yne (iv) But-2-yne

Explanation

To determine which of the given compounds possesses acidic character, we need to analyze the structures of each compound and identify the presence of acidic hydrogens. The acidic character in hydrocarbons is primarily associated with the ability to donate a proton (H⁺) and the stability of the resulting conjugate base.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We have four compounds to analyze:
- (i) Butane: \( \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3 \)
- (ii) But-1-ene: \( \text{CH}_3\text{CH}_2\text{CH}=\text{CH}_2 \)
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