The major product in the following reaction is-
`H_(3)C-C-=C-H+2HBr(excess)`

Options

A.
B. `H_(3)C-overset(Br)overset(|)underset(Br)underset(|)(C)-CH_(3)`
C. `H_(3)C-overset(H)underset(Br)underset(|)(C)-underset(Br)underset(|)(C)H_(2)`
D.

Explanation

To determine the major product of the reaction between propene (H3C-C≡C-H) and excess HBr, we will follow these steps:

### Step 1: Identify the Reactants
The reactant is propene, which has the structure:
```
H H
\ /
C
/ \
C C
| |
H H
```
This compound has a triple bond (C≡C) between two carbon atoms.

### Step 2: Understand the Reaction
The reaction involves the addition of hydrogen bromide (HBr) to the triple bond of propene. Since we have excess HBr, we can expect that both hydrogen and bromine will add across the triple bond.

### Step 3: Electrophilic Addition Mechanism
1. **Electrophilic Attack**: The hydrogen (H) from HBr acts as an electrophile and attacks the nucleophilic triple bond (C≡C). This results in the formation of a carbocation intermediate.
2. **Markovnikov's Rule**: According to Markovnikov's rule, the hydrogen atom will add to the carbon atom that has more hydrogen atoms already (the less substituted carbon), leading to a more stable carbocation on the more substituted carbon.

### Step 4: Formation of the Carbocation
When H adds to the terminal carbon (the one with more hydrogen atoms), a secondary carbocation is formed at the central carbon:
```
H H
\ /
C^+ (carbocation)
/ \
C C
| |
H Br
```

### Step 5: Nucleophilic Attack by Bromide Ion
The bromide ion (Br-) will then attack the carbocation, leading to the formation of the final product:
```
H H
\ /
C
/ \
C Br
| |
H H
```
This product is 2-bromopropane.

### Step 6: Final Product
The major product of the reaction is 2-bromopropane.

### Summary of the Reaction
The overall reaction can be summarized as:
\[ \text{H}_3\text{C}-\text{C} \equiv \text{C}-\text{H} + 2 \text{HBr} \rightarrow \text{H}_3\text{C}-\text{C}(\text{Br})-\text{C}(\text{H})-\text{H} \]

### Major Product
The major product is 2-bromopropane.

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