JEE Main · 2019 · Shift-IImediumGOC-111

The IUPAC name for the following compound is

General Organic Chemistry (GOC) · Class 11 · JEE Main Previous Year Question

Question

The IUPAC name for the following compound is image

Options
  1. a

    3-methyl-4-(3-methylprop-1-enyl)-1-heptyne

  2. b

    3, 5-dimethyl-4-propylhept-6-en-1-yne

  3. c

    3-methyl-4-(1-methylprop-2-ynyl)-1-heptene

  4. d

    3, 5-dimethyl-4-propylhept-1-en-6-yne

Correct Answerd

3, 5-dimethyl-4-propylhept-1-en-6-yne

Detailed Solution

image Step 1: Identifying the Longest Chain with Principle Functional Groups In a molecule with both a double and triple bond, both should be part of the principal chain if possible.

  • Step 2: Numbering In case of numbering, we are getting the same set of locants from both sides. In such cases, alphabetical priority is considered. So -ene gets priority over -yne.

Step 3: Conclusion Name: 3, 5-dimethyl-4-propylhept-1-en-6-yne.

Answer: (d) 3, 5-dimethyl-4-propylhept-1-en-6-yne\boxed{\text{Answer: (d) 3, 5-dimethyl-4-propylhept-1-en-6-yne}}

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