In the given reaction `[C_6H_5-CH_2-CH_2-overset(o+)(N)(CH_3)_2-CH_2-CH_3]overset(Theta)(OH)overset(Delta)rarr` (X) as major product will be

Options

A. `C_6H_5-CH=CH_2`
B. `CH_2=CH_2`
C. `C_6H_5-CH=CH-CH_3`
D. `CH_3-CH=CH-CH_3`

Answer

To solve the problem step by step, we will analyze the given compound and the reaction conditions to determine the major product formed.

### Step 1: Analyze the Given Compound
The compound provided is:
\[ C_6H_5-CH_2-CH_2-N(CH_3)_2-CH_2-CH_3 \]

This can be represented as:
- A benzene ring (C6H5)
- A chain of carbon atoms with an amine group (N(CH3)2) attached.

### Step 2: Identify the Reaction Conditions
The compound is treated with:
- Hydroxide ions (OH⁻)
- Heat (Δ)

### Step 3: Recognize the Type of Reaction
The reaction is likely a **Hofmann elimination**, which typically involves the removal of a hydrogen atom and a leaving group (in this case, the amine group) to form an alkene.

### Step 4: Identify Possible Hydrogen Atoms for Elimination
In Hofmann elimination, we look for hydrogen atoms that can be abstracted. The compound has two possible hydrogen atoms that can be eliminated:
1. The hydrogen on the carbon adjacent to the nitrogen (N(CH3)2).
2. The hydrogen on the carbon adjacent to the benzene ring.

### Step 5: Determine the Preferred Hydrogen for Elimination
The preferred hydrogen for elimination is generally the one that leads to the least stable alkene. In this case:
- The hydrogen adjacent to the nitrogen is sterically hindered due to the presence of the bulky dimethylamino group.
- The hydrogen adjacent to the benzene ring is less hindered.

Thus, the hydrogen adjacent to the nitrogen is preferred for abstraction.

### Step 6: Perform the Elimination Reaction
When the preferred hydrogen is abstracted, the following occurs:
- The nitrogen group leaves, and a double bond forms between the two carbon atoms.

This results in the formation of:
- Ethene (C2H4)
- The remaining structure with the benzene ring and the nitrogen group.

### Step 7: Write the Major Product
The major product of the reaction is:
\[ \text{Ethene} + \text{C}_6\text{H}_5-CH_2-CH_2-N(CH_3)_2 \]

### Final Answer
The major product (X) formed in the reaction is **Ethene**.

---