Which of the following has no multiple bonds

Options

A. `HCN `
B. `C_2H_2`
C. `C_2H_6`
D. `C_2H_2`

Explanation

To determine which of the given compounds has no multiple bonds, we need to analyze the bonding in each compound. Multiple bonds refer to double or triple bonds between atoms. Let's go through the options step by step.

### Step 1: Identify the compounds
The compounds we need to analyze are:
1. HCN (Hydrogen Cyanide)
2. C2H2 (Ethyne or Acetylene)
3. C2H6 (Ethane)
4. C2H4 (Ethylene)

### Step 2: Analyze HCN
- **Structure of HCN**: H - C ≡ N
- HCN has a triple bond between carbon (C) and nitrogen (N).
- **Conclusion**: HCN has multiple bonds.

### Step 3: Analyze C2H2
- **Structure of C2H2**: H - C ≡ C - H
- C2H2 has a triple bond between the two carbon atoms.
- **Conclusion**: C2H2 has multiple bonds.

### Step 4: Analyze C2H6
- **Structure of C2H6**: H - C - C - H
- Each carbon is bonded to three hydrogen atoms.
- C2H6 has only single bonds between the carbon atoms and between carbon and hydrogen.
- **Conclusion**: C2H6 has no multiple bonds.

### Step 5: Analyze C2H4
- **Structure of C2H4**: H - C = C - H
- C2H4 has a double bond between the two carbon atoms.
- **Conclusion**: C2H4 has multiple bonds.

### Final Answer
Based on the analysis, the compound that has no multiple bonds is **C2H6 (Ethane)**.

---