What is the expected major product for the following reaction sequence?
A) I
B) II
C) III
D) IV
E) V

Question

What is the expected major product for the following reaction sequence?  
A) I 
B) II 
C) III 
D) IV 
E) V

Quizplus · Accepted Answer

The reaction sequence starts with the conversion of an alkyne to a cis-alkene through catalytic hydrogenation. This will result in II as the major product. The alkene will then undergo halogenation at the terminal double bond, resulting in the addition of one Br atom to each carbon atom. This will result in III as the major product. The product III is an example of vicinal dihalide. Therefore, the correct answer is B.

What Is the Expected Major Product for the Following Reaction