Refer to the polymer scheme:  Further heating of the linear novolac with additional formaldehyde produces:
AJust water
BMore linear polymer
CCross-linked 3D thermosetting network = Bakelite
DAn alcohol
Answer & Solution
Correct answer: C. Cross-linked 3D thermosetting network = Bakelite
Linear novolac (acid-catalyzed condensation, low MW phenol-formaldehyde) + heat + extra HCHO → cross-linking through methylene bridges between para- and ortho- positions of adjacent phenol rings → rigid 3D network (Bakelite). Cannot remould (thermoset).
Related questions
The high tensile strength of nylon 6,6 comes from:Nylon 6,6 is prepared from adipic acid and:Polymers carrying amide linkages are termed:Condensation polymerisation eliminates simple molecules such as:Polythene and teflon are formed by polymerisation that is:Polythene chains are described as linear or slightly:Polymers that soften on heating and harden on cooling are:Polythene, built from one kind of monomer, is a: