The monomer of polystyrene is
C2H5CH = CH2
H2C = CH - Cl
C6H5 - CH = CH2
H2C = CH - CHO
Which of the following polymers have vinylic monomer units?
(a) Acrilan
(b) Polystyrene
(c) Nylon
(d) Teflon
Polystyrene is a /an