In the given reaction `CH_3-CH_2-overset(Br)overset(|)(CH)-CH=CH_2overset("Alc.KOH//Delta)rarr(X)` X will be

Options

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

Answer

To solve the given reaction `CH_3-CH_2-overset(Br)overset(|)(CH)-CH=CH_2overset("Alc.KOH//Delta)rarr(X)`, we will follow these steps:

### Step 1: Identify the Reactants
The reactant is a compound with a bromine (Br) leaving group attached to a carbon chain that also has a double bond. The structure can be represented as:
```
Br
|
CH3-CH2-C-CH=CH2
```
Here, the bromine is attached to the carbon that is also connected to the double bond.

### Step 2: Understand the Reaction Conditions
The reaction is carried out in the presence of alcoholic KOH and heat (Δ). Alcoholic KOH is a strong base that promotes elimination reactions, specifically dehydrohalogenation, which involves the removal of HX (where X is Br in this case).

### Step 3: Mechanism of the Reaction
In the dehydrohalogenation reaction:
1. The base (KOH) abstracts a proton (H) from a carbon adjacent to the carbon bonded to Br.
2. The bromine (Br) leaves, resulting in the formation of a double bond between the two carbons.

### Step 4: Determine the Possible Products
The elimination can occur in two ways:
- The proton can be abstracted from the carbon adjacent to the carbon with Br.
- The proton can be abstracted from the carbon on the opposite side of the double bond.

This leads to the formation of an alkene. The product will be a more stable alkene, which is typically the more substituted alkene (Zaitsev's rule).

### Step 5: Identify the Final Product
After considering the stability of the possible products, we find that the more stable product is a conjugated diene. The final structure will have a double bond between the two carbons that were involved in the elimination, and the resulting product will be:
```
CH2=CH-CH=CH2
```
This represents a conjugated diene, which is more stable due to the overlap of p-orbitals.

### Conclusion
The product X formed from the reaction is:
```
X = CH2=CH-CH=CH2 (1,3-butadiene)
```