Question

Which of the following statements are correct about the addition of $HBr$ to buta-1, 3-diene?

• A. $1,2$-Addition product
  
  is the major product at lower temperature $(-80^{\circ }C)$ and is a kinetic control or rate-controlled product
• B. $1,4$-Addition product
  
  is the major product at high temperature $(40^{\circ }C)$ and is a thermodynamic or equilibrium-controlled product
• C. In a non-polar solvent (e.g., hexane), 1,2-addition product is predominantly favoured
• D. In a polar solvent (e.g., acetic acid) 1,4-addition product is predominantly favoured

Answer 1

Answer: (A), (B), (C), (D)

Correct answer is (a) $1,2$-Addition product

is the major product at lower temperature $(-80^{\circ }C)$ and is a kinetic control or rate-controlled product Correct answer is (b) $1,4$-Addition product

is the major product at high temperature $(40^{\circ }C)$ and is a thermodynamic or equilibrium-controlled product Correct answer is (c) In a non-polar solvent (e.g., hexane), 1,2-addition product is predominantly favouredCorrect answer is (d) In a polar solvent (e.g., acetic acid) 1,4-addition product is predominantly favoured