All types of hydrocarbons undergo______giving `CO_2, H_2O` and heat. (chlorination, combustion, hydrogenation)

Explanation

To solve the question "All types of hydrocarbons undergo______ giving `CO_2, H_2O` and heat," we need to analyze the options provided: chlorination, combustion, and hydrogenation.

### Step-by-Step Solution:

1. **Understanding Hydrocarbons**: Hydrocarbons are organic compounds made up of hydrogen and carbon atoms. They can be classified into different types, such as alkanes, alkenes, and alkynes.

2. **Analyzing the Options**:
- **Chlorination**: This is a reaction where chlorine is added to hydrocarbons, often replacing hydrogen atoms. It does not primarily produce `CO_2` and `H_2O`.
...