(a) How is Buna-N prepared? Give equation
(b) Name the monomers of Nylon-6, 6.
(c) What are thermosetting polymers?

Explanation

(a) By co-polymerization of 1,3-butadiene and acrylonitrile in the presence of peroxide or sodium catalyst.
`n underset(1,3 - "Butadiene")([CH_2-CH-CH-CH_2])+n underset("Acrylonitrile")([CH_2-overset(CN)overset(|)(CH)]) to underset("Buna-N")([CH_2-CH=CH-CH_2-CH-overset(CN)overset(|)(CH)]_(n))`.
Detailed Answer :
(a) `n underset(1,3 - "Butadiene")(CH_2=CH-CH=CH_2) + underset("Acrylonitrile")(CH_2 = CH-CH)underset(Delta)overset("Peroxide")(rarr) underset("Buna-N")([CH_2-CH=CH-CH_2-CH-overset(CN)overset(|)(CH)]_(n))`
(b) Adipic acid s and Hexa methylene diamine
(c) The polymers which undergo permanent chemical change on heating and undergo extensive cross linking in mould, become hard, infusible and nonreversible plastic.
Detailed Answer:
(c) They do not become soft on heating and cannot be remoulded. They haye strong force of attraction eg. bakelite.