




The given reaction scheme involves two steps to find the major product Y.
Step 1: Reaction of Pyridine with HBr
Pyridine reacts with hydrobromic acid (HBr) to form pyridinium bromide, which is an organic salt denoted as X.
Step 2: Formation of Product Y
The compound X (pyridinium bromide) reacts with trans-stilbene in the presence of bromine (Br2) and acetic acid (AcOH) to form the dibromide derivative as the major product Y.
Product Analysis:
The addition of bromine across the double bond of trans-stilbene leads to the formation of the major product. The correct structure of Y matches the following option:
Conclusion:
The major product Y in the given reaction scheme is the dibromide derivative of trans-stilbene, shown in the correct answer option.