Question

Which of the following statements are correct about phenolformaldehyde resin?

• A. Novolac or resol is a linear polymer and is used in the manufacture of adhesive.
• B. Bakelite is a cross-linked polymer and is used in making switches and plugs.
• C. Novolac is prepared when (P/F) (phenol/formaldehyde) ratio is greater than 1 , whereas bakelite is prepared when (P/F) ratio is less than $1 .$
• D. Novolac is prepared when $P / F < 1$, and bakelite is prepared when $P / F >1$.

Answer 1

Answer: (A), (B), (C)

Correct answer is (a) Novolac or resol is a linear polymer and is used in the manufacture of adhesive.Correct answer is (b) Bakelite is a cross-linked polymer and is used in making switches and plugs.Correct answer is (c) Novolac is prepared when (P/F) (phenol/formaldehyde) ratio is greater than 1 , whereas bakelite is prepared when (P/F) ratio is less than $1 .$