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

(N/A) This process is known as vulcanization of rubber and the product is known as vulcanized rubber. In this process,sulphur forms cross-links at the reactive sites of double bonds in the polymer chains,making the rubber harder and more durable. The structure of vulcanized rubber is represented as follows:
$\sim CH_2-C(CH_3)-CH-CH_2 \sim$
$| \quad \quad \quad |$
$S \quad \quad \quad S$
$| \quad \quad \quad |$
$\sim CH_2-C(CH_3)-CH-CH_2 \sim$