Master IUPAC Naming in Minutes! | JEE Main 2019 Chemistry | Shreyash Chemistry

Описание: 🔬 JEE Main 2019 Chemistry | IUPAC Naming Trick You Must Know! 🔬

🚀 Welcome to Shreyash Chemistry! In this video, we break down JEE Main 2019 Question 31, explaining the IUPAC naming of alkenes with halogens and alkyl groups in the simplest way. If you struggle with Organic Chemistry nomenclature, this video is for you!

🧪 Step-by-Step Explanation:

Step 1: Identify the Parent Chain
✔ The longest chain that contains the double bond (-C=C-) is selected.
✔ Here, the longest chain has 5 carbon atoms, making it a pentene (pent-2-ene) derivative.

Step 2: Numbering the Chain
✔ The double bond (-C=C-) should get the lowest possible number when numbering the chain.
✔ Numbering starts from the end closest to the double bond, placing it at C-2.

Step 3: Identify and Name Substituents
✔ Bromine (-Br) is attached at carbon 4.
✔ Methyl (-CH₃) is attached at carbon 3.

Step 4: Assemble the Name
✔ The final IUPAC name follows this order:
Substituents (alphabetical order) + Parent Chain + Position of Double Bond
✔ Correct IUPAC Name: 4-Bromo-3-methylpent-2-ene

✅ Correct Answer: Option (3)

🎯 Common Mistakes to Avoid:

❌ Choosing a shorter chain instead of the longest possible one.
❌ Giving priority to substituents over the double bond while numbering.
❌ Incorrect alphabetical order of substituents.

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