The reaction `CH_2=CH_2+H_2rarrH_3C_CH_3` involve

Options

A. addition of hydrogen
B. addition of electronegative element
C. removal hydrogen
D. both(2) and (3)

Answer

To solve the question regarding the reaction \( CH_2=CH_2 + H_2 \rightarrow H_3C-CH_3 \), we need to analyze the components and the type of reaction taking place.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactant \( CH_2=CH_2 \) is ethylene (or ethene), which is an unsaturated hydrocarbon due to the presence of a double bond.
- The other reactant is \( H_2 \), which is molecular hydrogen.

2. **Identify the Product**:
- The product \( H_3C-CH_3 \) is ethane, which is a saturated hydrocarbon. It has only single bonds between carbon atoms.

3. **Type of Reaction**:
- The reaction involves the addition of hydrogen (H₂) to the double bond of ethylene. This process is known as hydrogenation.
- In hydrogenation, the double bond in the unsaturated compound (ethylene) is converted into a single bond (as in ethane) by the addition of hydrogen.

4. **Reaction Mechanism**:
- The double bond in ethylene opens up to accommodate the hydrogen atoms.
- Each carbon atom in the double bond forms a new single bond with a hydrogen atom from H₂, resulting in the formation of ethane.

5. **Final Reaction**:
- The balanced chemical equation for the reaction is:
\[ CH_2=CH_2 + H_2 \rightarrow H_3C-CH_3 \]
- This indicates that one molecule of ethylene reacts with one molecule of hydrogen to produce one molecule of ethane.

### Summary:
The reaction \( CH_2=CH_2 + H_2 \rightarrow H_3C-CH_3 \) is an example of hydrogenation, where ethylene (an unsaturated compound) is converted into ethane (a saturated compound) through the addition of hydrogen.