3-Methylhex-2-ene on reaction with HBr in presence of peroxide forms an addition product (A). The number of possible stereoisomers for 'A' is ______.
Correct Answer: 4
Approach Solution - 1
- Initial Reaction: In the presence of peroxide, HBr adds to the alkene via a radical mechanism. The addition occurs at the terminal carbon to form the anti-Markovnikov product.
- Structural Analysis: The product of this reaction is 1-bromo-3-methylhexane.
- Chirality Considerations: In 1-bromo-3-methylhexane, two chiral centers are present at C-2 and C-3.
- Stereoisomers Calculation: The number of possible stereoisomers is given by 2n, where n is the number of chiral centers. Here, n = 2, thus 22 = 4 stereoisomers are possible.
- Verification: These stereoisomers correspond to different spatial arrangements at C-2 and C-3: RR, SS, RS, and SR configurations.
- Range Validation: The computed solution, 4, falls within the given range (4,4).
Approach Solution -2
The structure of the product formed will have two chiral centers due to anti-Markovnikov addition of HBr in the presence of peroxide:
With two chiral centers, the number of stereoisomers is:
\[ 2^{\text{chiral centers}} = 2^2 = 4 \]
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