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Which of the following structures represents Neoprene polymer?
A
$-[CH(C_6H_5)-CH_2]_n-$
B
$-[CH_2-C(Cl)=CH-CH_2]_n-$
C
$-[CH_2-CH(CN)]_n-$
D
$-[CH_2-CH(Cl)]_n-$
Detailed Solution
Neoprene (polychloroprene) is a synthetic rubber formed by free radical addition polymerisation of chloroprene, 2-chloro-1,3-butadiene.
$n\ CH_2=C(Cl)-CH=CH_2 \rightarrow -[CH_2-C(Cl)=CH-CH_2]_n-$
Polymerisation occurs by 1,4-addition, leaving one double bond in each repeating unit.
$-[CH(C_6H_5)-CH_2]_n-$ is polystyrene, $-[CH_2-CH(CN)]_n-$ is polyacrylonitrile (orlon) and $-[CH_2-CH(Cl)]_n-$ is polyvinyl chloride (PVC).
Hence neoprene is $-[CH_2-C(Cl)=CH-CH_2]_n-$.
$n\ CH_2=C(Cl)-CH=CH_2 \rightarrow -[CH_2-C(Cl)=CH-CH_2]_n-$
Polymerisation occurs by 1,4-addition, leaving one double bond in each repeating unit.
$-[CH(C_6H_5)-CH_2]_n-$ is polystyrene, $-[CH_2-CH(CN)]_n-$ is polyacrylonitrile (orlon) and $-[CH_2-CH(Cl)]_n-$ is polyvinyl chloride (PVC).
Hence neoprene is $-[CH_2-C(Cl)=CH-CH_2]_n-$.