1.  isobutylene and isoprene

2.  isobutylene and acrylonitrile

4.  styrene and butadiene

1.  Ni

2.  V2O5

3.  AICI3

1.  Starch

2.  synthetic rubber

4.  PVC

1.  a light absorbed by solution

2.  light transmitted by the solution

4.  none of the above

2.  Glyptal

3.  Nylon-6

4.  Buna-S

2.  Sulphur

3.  Sodium

4.  Strain

1.  Polystyrene

2.  Polyethylene

3.  Polypropylene

2.  O2 and N2

3.  O2and O3

4.  O3and N2

1.  Difluoroethane

2.  Monofluoroethene

4.  Trifluoroethane

2.  Terylene

3.  Teflon

4.  Bakelite