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When a single molecule of HBr reacts with a single molecule of 1,3-butadiene at 40°C, the major product formed is

1. 1-bromo-2-butene formed under kinetic control
2. 3-bromobutene formed under thermodynamic control
3. 1-bromo-2-butene formed under thermodynamic control
4. 3-bromobutene formed under kinetic control

Correct answer: 1-bromo-2-butene formed under thermodynamic control

Solution

The correct option is right because at higher temperatures, the reaction favors the formation of the more stable product, which in this case is 1-bromo-2-butene. This product is formed under thermodynamic control, indicating that the reaction has reached equilibrium and the more stable product predominates.

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