Question

What is the IUPAC name of Isoprene?

• A. 2-chloro-1,3-butadiene
• B. 2-methyl-3-chlorobut-1-ene
• C. 2-methyl-1,3-butadiene
• D. 2-methoxy butane

Hint:

Isoprene is a four-carbon diene with a methyl group on the second carbon.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Isoprene is the monomer of natural rubber, \(\text{CH}_2=\text{C}(\text{CH}_3)-\text{CH}=\text{CH}_2\).

Step 2: Naming
The longest chain containing both double bonds has four carbons, so the parent is butadiene with double bonds at C-1 and C-3.
Numbering from the end nearer the branch puts the methyl on C-2.

Step 3: Conclusion
The name is 2-methyl-1,3-butadiene.

Final Answer:
The IUPAC name of isoprene is 2-methyl-1,3-butadiene. \[ \boxed{\text{(C) }\text{2-methyl-1,3-butadiene}} \]