Question

Consider the following statements:
(A). 1,2-addition reaction occurs faster as compared to 1,4-addition reaction but the 1,4- addition product is more stable.
(B). Formation of 1,2-addition product is kinetic or rate-controlled.
(C). Formation of 1,4-addition product is thermodynamic or equilibrium controlled.
(D). At low temperature, the formation of the 1,2-addition product from allyl cation is a reversible reaction.
Choose the correct answer from the options given below:

• A. (A), (B), and (D) only.
• B. (A), (B), and (C) only
• C. (A), (B), (C), and (D)
• D. (B), (C), and (D) only

Hint:

Kinetic products are faster to form but less stable, while thermodynamic products are more stable but form slower.

Answer 1

The Correct Option is B

The 1,2-addition product forms faster and is a kinetic product, while the 1,4-addition product is more stable and is the thermodynamic product. The reaction is reversible at low temperature, and the 1,2-addition product is controlled by the rate.