22869.Which of the following organic compounds polymerizes to form the polyester Dacron?
Propylene and para HO — (C6H4) — OH
Benzoic acid and ethanol
Terephthalic acid and ethylene glycol
Benzoic acid and para HO — (C6H4) — OH
22870.Natural rubber has
Alternate cis – and trans–configuration
Random cis – and trans–configuration
All cis–configuration
All trans–configuration
22871.Which of the following statements about low density polythene is FALSE?
It is a poor conductor of electricity
Its synthesis requires dioxygen or a peroxide initiator as a catalyst
It is used in the manufacture of buckets, dustbins etc.
Its synthesis requires high pressure
22872.Correct statement for thermoplastic polymer is
It does not become soft on heating under pressure
It can not be remoulded
It is either linear or branched chain polymer
It is cross–linked polymer
22875.The species which can best serve as an initiator for the cationic polymerization is:
LiAlH4
HNO3
AlCl3
BaLi
22877.Which polymer is used in the manufacture of paints and lacquers?
Bakelite
Glyptal
Polypropene
Polyvinyl chloride