The number of acidic hydrogen atoms in 1 - butyne and 2 - butyne respectively are

Options

A. 1, 0
B. 0, 1
C. 1, 1
D. 1, 2

Answer

To determine the number of acidic hydrogen atoms in 1-butyne and 2-butyne, we need to analyze the structure of each compound and identify the hydrogen atoms that can be released as protons (H⁺) in a reaction.

### Step-by-Step Solution:

1. **Identify the Structure of 1-butyne**:
- 1-butyne has the structure: CH₃-CH₂-C≡C-H.
- In this structure, the terminal hydrogen (attached to the carbon with the triple bond) is acidic.

2. **Count the Acidic Hydrogen Atoms in 1-butyne**:
- In 1-butyne, there is **1 acidic hydrogen atom** (the one attached to the terminal carbon with the triple bond).

3. **Identify the Structure of 2-butyne**:
- 2-butyne has the structure: CH₃-C≡C-CH₃.
- In this structure, there are no terminal hydrogen atoms because both ends of the triple bond are attached to carbon atoms that are also connected to other carbon atoms.

4. **Count the Acidic Hydrogen Atoms in 2-butyne**:
- In 2-butyne, there are **0 acidic hydrogen atoms** since there are no terminal hydrogens available for ionization.

### Final Answer:
- The number of acidic hydrogen atoms in 1-butyne is **1**.
- The number of acidic hydrogen atoms in 2-butyne is **0**.