Filling in the blanks
___________ is a monomer of polythene.

Q. Polythene is a polymer. The monomer of this is:

Q.

Match the entries of column I with column II:

Polymer	Monomer
a. Natural rubber	i. Monomer
b. Polythene	ii. Vinyl chloride
c. Polyvinyl chloride	iii. Isoprene

Q. Fill in the blanks:

(a) A new substance is always formed in a ______ change.

Q. a) i) Explain the preparation of Buna-N.
ii) Give an example for thermosetting polymer.
b) Name the monomers used in the preparation of polythene and natural rubber.

Q. Fill in the blanks:
(e) Burning of a fuel is a change.