JEE Main Chemistry question

IUPAC name of CH₃CH₂C(Br)=CHCl is

(A)2-bromo-1-chlorobut-1-eneCorrect
(B)1-chloro-2-bromobut-1-ene
(C)3-chloro-2-bromobut-2-ene
(D)None of the above

Answer: (A)

Solution

Since no suffix-eligible principal characteristic group is present, the lowest locant is first given to the C=C (then to substituents). Numbering from the CHCl end places the double bond at

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Question ID VK-138986