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a
1-Choro-4-bromo-2-butene
b
1-Bromo-4-chloro-2-butene
c
4-Bromo-1-chloro-2-butene
d
4-chloro-1-bromo-2-butene
answer is B.
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Detailed Solution
Step - 1The given compound is halogenated unsaturated hydro carbon.The numbering to the parent chain giving in alphabetical order.The substituents bromo at C1 and chloro at C4.Position of double bond is at C2.