Concept:The stability of the carbanion intermediate decides the major product in this elimination reaction.
Explanation:The reaction proceeds through a carbanion intermediate.
The carbanion that gives the product in option (D) is more stable.
This is because the negative charge can be delocalised effectively by resonance.
The alternative carbanion suffers from steric inhibition of resonance.
In that case, the bulky groups force the resonance-containing groups out of planarity.
As a result, resonance is reduced and the carbanion becomes less stable.
Therefore, the reaction favours the pathway that forms the more stable carbanion.
This leads to the product shown in option (D).
Answer:Option (D) is the major product.
