Multiple choice

Novolak resin is formed

  1. by the condensation of hexamethylenediamine and 1, 10 decandioic acid

  2. when isocyanate reacts with alcohol

  3. by heating excess of phenol with formaldehydes (P/F ratio nearly 1.25) in the presence of acid catalyst

  4. by the interaction of phenol with excess formaldehydes (P/F ratio nearly 0.8)

  5. when urea is heated at 300oC and 100 atmospheric pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because when excess of phenol is heated with formaldehydes (P/F ratio nearly 1.25) in the presence of the acid catalyst, novolak resin is formed.

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