Select odd one out in the `CH_4, C_2H_4, C_3H_6, C_4H_8`

Explanation

To solve the question of selecting the odd one out among the compounds CH₄, C₂H₄, C₃H₆, and C₄H₈, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compounds**: The given compounds are:
- CH₄ (Methane)
- C₂H₄ (Ethylene)
- C₃H₆ (Propylene)
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