Correct Answer: Option B

Explanation

Longest Carbon Chain: The longest continuous chain containing the double bond has 4 carbons, making the parent name butene.

Numbering: The chain is numbered from the end that gives the double bond the lowest possible locant. Numbering from left to right puts the double bond at carbon 2

• Substituents:
  • A chloro group is attached to carbon 2.
  • A methyl group is attached to carbon 3.
• Final Assembly: Combining these alphabetical substituents with the parent chain results in 2-chloro-3-methylbut-2-ene.

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