Question

Consider the following reaction
The incorrect statement about this reaction is that:

• A. in the intermediate, the positive charge on the secondary carbon is larger than on primary carbon, resulting in the more rapid formation of A
• B. in B the double bond is more stabilized by hyperconjugation than in A.
• C. at higher temperature B is the major product
• D. under the kinetically controlled condition, A and B can easily interconvert

Answer 1

The correct option is D under the kinetically controlled condition, A and B can easily interconvert

(A) In the intermediate, the positive charge on the secondary carbon is larger than on primary carbon, resulting in the more rapid formation of A. This is true because secondary carbon carbocation is stable due to resonance.

(B) In B the double bond is more stabilized by hyperconjugation than in A. This is true because B has 5 $H$ for hyperconjugation but A has only 1 $H$.

(C) A is a kinetically controlled product and B is thermodynamically controlled, so at higher temperatures B will be stable and major product.

(D) is false because A is kinetically controlled product so it cannot be easily converted into B.