Question

What is the final major product "B" of the following reaction?

• A. 2, 4-dichlorobutane
• B. 1, 2-dichlorobutane
• C. 2, 3-dichlorobutane
• D. None of the above

Answer 1

The correct option is C 2, 3-dichlorobutane

While adding $H_2$ to alkyne, if the reduction is to be stopped at the alkene stage, the catalyst needs to be poisoned with $CaC{O}_3$/$BaS{O}_4$/quinoline. Addition of $C{l}_2$ in presence of $CC{l}_4$ takes place by anti addition. (Two substituents are added to the opposite sides of a $\pi$ bond).