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, let's analyze the reaction and apply the concepts of elimination reactions, particularly Hofmann elimination.

### Step 1: Understand the Structure
The compound provided in the reaction is a tertiary amine with a phenyl group. The structure can be drawn as follows:

- The phenyl group (C6H5) is attached to a CH2 group.
- This CH2 group is connected to another CH2 group, which is then connected to a nitrogen atom (N) that has two methyl groups (CH3) attached to it.
- The nitrogen is positively charged, indicating that it is a quaternary ammonium ion.

### Step 2: Identify the Type of Reaction
The reaction involves the use of OH⁻ (hydroxide ion) and heating, which suggests that we are dealing with an elimination reaction. Given that we have a quaternary ammonium ion, this points towards Hofmann elimination.

### Step 3: Apply Hofmann Elimination
In Hofmann elimination, the reaction typically leads to the formation of the least stable alkene (the less substituted alkene).

1. The hydroxide ion (OH⁻) can abstract a hydrogen atom from the carbon adjacent to the nitrogen.
2. There are two possible hydrogen atoms that can be abstracted:
- One from the CH2 group adjacent to the nitrogen.
- The other from the CH2 group that is further away from the nitrogen.

### Step 4: Determine the Major Product
- If the hydrogen from the CH2 group adjacent to the nitrogen is abstracted, the product will be ethylene (CH2=CH2).
- If the hydrogen from the CH2 group further away from the nitrogen is abstracted, the product will be styrene (C6H5-CH=CH2), which is more substituted and therefore more stable.

According to Hofmann elimination, the major product will be the less substituted alkene, which in this case is ethylene.

### Step 5: Conclusion
The major product (X) formed in this reaction is ethylene (CH2=CH2).

### Final Answer
The major product (X) will be ethylene (CH2=CH2).

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