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Natural rubber has
A
all trans-configuration.
B
alternate cis - and trans-configuration.
C
random cis - and trans-configuration.
D
all cis - configuration.
Explanation
Natural rubber is all-cis polyisoprene.
Detailed Solution
Chemically, natural rubber is cis-polyisoprene.
$nCH_2=C(CH_3)-CH=CH_2 \xrightarrow{Polymerisation} [-CH_2-C(CH_3)=CH-CH_2-]_n$ (cis-polyisoprene)
$nCH_2=C(CH_3)-CH=CH_2 \xrightarrow{Polymerisation} [-CH_2-C(CH_3)=CH-CH_2-]_n$ (cis-polyisoprene)