Distinction between pairs of compounds
Ethylene and Acetylene.

Explanation

### Step-by-Step Text Solution

**1. Definition and Structure:**
- **Ethylene (C2H4)**: Ethylene is an alkene characterized by a double bond between two carbon atoms. Its structural formula is CH2=CH2.
- **Acetylene (C2H2)**: Acetylene is an alkyne characterized by a triple bond between two carbon atoms. Its structural formula is HC≡CH.

**2. Type of Bonding:**
- **Ethylene**: Contains a double bond (C=C), which means it has one sigma bond and one pi bond between the two carbon atoms.
...