Question

Reaction of one molecule of $HBr$ with one molecule of 1, 3-Butadiene at ${40}^{\circ }c$ gives predominantly:

• A. 3-bromobutene under kinetically controlled condition
• B. 1-bromo-2-butene under thermodynamically controlled condition
• C. 3-bromobutene under thermodynamically controlled condition
• D. 1-bromo-2-butene under kinetically controlled condition

Answer 1

The correct option is B 1-bromo-2-butene under thermodynamically controlled condition

1,2-addition is a kinetically controlled product while 1,4-addition is a thermodynamically controlled product formed comparatively at a higher temperature.