Question:medium

What is IUPAC name of following compound?

Choose the correct answer from the options given below.

Show Hint

Always prioritize the double bond over alkyl or halogen substituents when numbering the carbon chain. Once you establish that the longest chain has 7 carbons and the double bond starts at position 3, "hept-3-ene" isolates option (B) as the only logical choice.
Updated On: Jun 18, 2026
  • 5-Chloro-3-methylhept-4-ene
  • 3-Chloro-5-methylhept-3-ene
  • 3-Chloro-5-ethylhex-3-ene
  • 4-Chloro-2-ethylhex-3-ene
Show Solution

The Correct Option is B

Solution and Explanation

Step 1: Understanding the Question:
Assign the IUPAC name to a branched alkene bearing a chlorine substituent.

Step 2: Key Formula or Approach:
Find the longest chain containing C=C, number to give the double bond the lowest locant, list substituents alphabetically.

Step 3: Detailed Explanation:
The longest chain through the double bond has 7 carbons → heptene (ruling out hexene options C and D). Numbering left-to-right places the double bond at C3 (vs C4 right-to-left), so C3 is chosen. Substituents: chloro at C3, methyl at C5. Alphabetically: 3-chloro-5-methylhept-3-ene.

Step 4: Final Answer:
Correct name is 3-Chloro-5-methylhept-3-ene, option (B).
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