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Question:

Natural rubber has: random cis- and trans-configuration; alternate cis- and trans-configuration; all cis-configuration; all trans-configuration

all trans-configuration

random cis-and trans-configuration

all cis-configuration

alternate cis- and trans-configuration

Solution:

Natural rubber has all cis-configuration. Natural rubber is a linear polymer of cis isoprene, cis-2-methyl-1,3-butadiene.