Choose the Best Answer · Q9
Q.Which is the monomer of neoprene in the following?
(a) CH2=C(Cl)-CH=CH2
(b) CH2=CH-C≡CH
(c) CH2=CH-CH=CH2
(d) CH2=C(CH3)-CH=CH2
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Start your 14-day free trial to unlock the full solution →Step 1. The unit states directly: "The free radical polymerisation of the monomer, 2-chloro buta-1,3-diene (chloroprene) gives neoprene" (15.4.5) -- a four-carbon diene with a chlorine substituent on the second carbon.
Step 2. Option (b), CH2=CH-C≡CH, is vinylacetylene (but-1-en-3-yne) -- it has a triple bond, not a second double bond, so it cannot be the diene monomer of a rubber.
Step 3. Option (c), CH2=CH-CH=CH2, is plain buta-1,3-diene -- the correct carbon skeleton, but with no chlorine substituent, so it is butadiene (used in Buna-N/Buna-S), not chloroprene. …
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