MHT CET Medical202622 April 2026Morning ShiftChemistryGeneral Organic ChemistryActual
What is IUPAC name of Isoprene?
Options
- A2-chloro-1,3-butadine
- B2-methyl- 3-chlorobut-1-en
- C2-methyl- 1, 3-butadine
- D2-methoxy butane
Correct answer
C. 2-methyl- 1, 3-butadine
Step-by-step solution
Isoprene is the common name for the conjugated diene with the chemical formula C₅H₈ . The structure of isoprene is CH₂=C(CH₃)-CH=CH₂ . Selecting the longest carbon chain containing both double bonds gives a four-carbon chain (butadiene). Numbering the chain to give the lowest locants to the double bonds and substituents, the double bonds are at positions 1 and 3, and the methyl group is at position 2. Thus, the IUPAC name is 2-methyl-1,3-butadiene. Answer: 2-methyl- 1, 3-butadine