Question

Phenol and fomaldehyde undergo condensation to give a polymar (A) which on heating with formaldehyde gives a thermosetting polymer (B) Name the polymers. Write the reaction involved in the formation of (A) what is the structural difference between two polymers?

Answer 1

Phenol and formaldehyde undergo condensation to give a polymer novolac (A) which on heating with formaldehde gives bakelite(B) as a thermosetting polymer
Sequenc of the reaction can be written as

Structural difference in between these two is that novolac is a linear polymer while bakelite is a cross linked polymer.