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Halogenation of Alkynes

What is the f...

Question

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

A

2, 4-dichlorobutane

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B

1, 2-dichlorobutane

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C

2, 3-dichlorobutane

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D

None of the above

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Solution

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 $C a C O_{3}$ / $B a S O_{4}$ /quinoline. Addition of $C l_{2}$ in presence of $C C l_{4}$ takes place by anti addition. (Two substituents are added to the opposite sides of a $π$ bond)

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Halogenation of Alkynes

Standard XII Chemistry

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