The number of triple bonds between two C atoms in a molecule of ethyne is

Options

A. three
B. two
C. one
D. zero

Answer

To determine the number of triple bonds between two carbon atoms in a molecule of ethyne, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compound**: We need to analyze the compound ethyne. Ethyne is an alkyne, which is a type of hydrocarbon.

2. **Understand the General Formula**: The general formula for alkynes is \( C_nH_{2n-2} \). For ethyne, which has 2 carbon atoms (\( n = 2 \)), we can substitute \( n \) into the formula:
\[ C_2H_{2(2)-2} = C_2H_2 \]

3. **Draw the Structure**: The molecular structure of ethyne (C2H2) can be represented as:
\[ H - C \equiv C - H \]
Here, the triple bond between the two carbon atoms is denoted by the triple line (≡).

4. **Count the Triple Bonds**: In the structure of ethyne, we can observe that there is one triple bond between the two carbon atoms.

5. **Conclusion**: Therefore, the number of triple bonds between the two carbon atoms in a molecule of ethyne is **1**.

### Final Answer:
The number of triple bonds between two C atoms in a molecule of ethyne is **1**.

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