Question:
The major product obtained by the addition reaction of HBr to 4-Methylpent-1-ene in the presence of peroxide is
The major product obtained by the addition reaction of HBr to 4-Methylpent-1-ene in the presence of peroxide is
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Peroxide present ⇒ Anti-Markovnikov addition (only for HBr)
Updated On: May 2, 2026
- 1-Bromo-4-methylpentane
- 4-Bromo-2-methylpentane
- 2-Bromo-4-methylpentane
- 3-Bromo-2-methylpentane
- 2-Bromo-2-methylpentane
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Concept: Anti-Markovnikov addition (Peroxide effect)
---
Step 1: Identify reaction condition
Presence of peroxide indicates free radical mechanism → Anti-Markovnikov addition. ---
Step 2: Write structure
\[ CH_2=CH-CH_2-CH(CH_3)-CH_3 \] ---
Step 3: Apply Anti-Markovnikov rule
• Br attaches to less substituted carbon
• H attaches to more substituted carbon ---
Step 4: Product formation
\[ \text{1-Bromo-4-methylpentane} \] --- Final Answer: \[ \boxed{\text{Option (A)}} \]
---
Step 1: Identify reaction condition
Presence of peroxide indicates free radical mechanism → Anti-Markovnikov addition. ---
Step 2: Write structure
\[ CH_2=CH-CH_2-CH(CH_3)-CH_3 \] ---
Step 3: Apply Anti-Markovnikov rule
• Br attaches to less substituted carbon
• H attaches to more substituted carbon ---
Step 4: Product formation
\[ \text{1-Bromo-4-methylpentane} \] --- Final Answer: \[ \boxed{\text{Option (A)}} \]
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