What is the role of benzoyl peroxide in addition polymerisation of alkenes ?

2

(a)

A natural linear polymer of 2-methyl-1,3-butadiene becomes hard on treatment with sulphur between 373 to 415K and -S-S-  bonds are formed between chains.Write the structure of the product of this treatment?

2

(a)

Out of chain growth polymerisation and step growth polymerisation, in which type will you place the following: (A)_m + (A)_m(A)_n or (A A)_m+n 

2

(a)

Why are rubbers called a elastomer?

2

(a)

can enzyme be called a polymer?

2

(a)