Multiple choice

Match the entries in Group-I with those in Group-II ||| |---|---| |Group-I (polymers)|Group-II (corresponding precursor units)| |P. Neoprene|1. vinyl alcohol| |Q. PVA|2. phenol and formaldehyde| |R. Terylene|3. chloroprene| |S. Bakelite| 4. ethylene glycol and dimethylterephthalate |

  1. P - 2, Q - 4, R - 3, S - 1

  2. P - 2, Q - 4, R - 1, S - 3

  3. P - 3, Q - 1, R - 4, S - 2

  4. P - 3, Q - 2, R - 4, S - 1

  5. P - 4, Q - 1, R - 3, S - 2
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C Correct answer
Explanation

The monomeric precursor unit for neoprene (NP) is chloroprene. Vinyl alcohol is the precursor unit of polyvinyl alcohol (PVA). Terylene is prepared by the reaction of ethylene glycol and dimethylterephthalate. The precursor unit of phenol formaldehyde resin (PFR) or bakelite is phenol and formaldehyde. Hence, the presentation of codes P - 3, Q - 1, R - 4, S - 2 is correct.

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