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Question:

Isoprene is: 2-methyl-1,3-butadiene, 3-methyl-1,2-butadiene, 3-chloro-1,2-butadiene, 2-chloro-1,3-butadiene

3-chloro-1,2-butadiene

2-methyl-1,3-butadiene

2-chloro-1,3-butadiene

3-methyl-1,2-butadiene

Solution:

H2C=C|CH3−CH=CH2
Isoprene is a monomer of natural rubber. Its formula is 2-methyl-1,3-butadiene.