Multiple choice

Polyurethane is formed when

  1. hexamethylene disocyanate and tetramethylene glycol undergo step reaction polymerisation

  2. melamine and formaldehyde resin give a polymer

  3. phenol and formaldehyde react in presence of dilute acid

  4. adipic acid and hexamethylene polymerise

  5. None of these
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A Correct answer
Explanation

Hexamethylene diisocyanate and tetramethylene glycol undrego step reaction polymerisation to produce polyurethane.

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