Chemistry - Halogen Derivative Question with Solution | TestHub
In which reaction, incorrect major organic product is given-
Options:
Answer:
Solution:
The reaction in option (D) is an addition of HBr to 1,3-cyclohexadiene. This is an example of an electrophilic addition to a conjugated diene, which can result in both 1,2-addition and 1,4-addition products. The stability of the intermediate allylic carbocation allows for resonance, leading to two possible products.
The proposed product in (D) is a 1,2-addition product: 3-bromo-1-cyclohexene. The major product under thermodynamic control (which is generally assumed unless otherwise specified, or implied by low temperature/kinetic control) is typically the 1,4-addition product. 3-bromo-1-cyclohexene is not the only product, and often not the major one.
The other options represent standard Markovnikov additions or substitutions with correct major products:
(A) Nucleophilic substitution of with following an E1-like mechanism to form a stable carbocation intermediate. (B) Markovnikov addition of HBr to an alkene. (C) Markovnikov addition of HBr to an alkene.
Therefore, the product shown in option (D) is likely not the only or major organic product under typical conditions, making it the incorrect option among the choices.
