What are broad-spectrum antibiotics? How are polythene and neoprene prepared?

Explanation

Those antibiotics which are effective against a wide range of gram positive and gram negative bacteria are known as broad - spectrum antibiotics.
Polyethene:
`nCH_(2) = CH_(2) overset("Polymerisation")(to) underset("Repeating unit")(CH_(2) - CH_(2)) - to -(underset("Polyethene")(CH_(2) - CH_(2)))_(n) -`