Buna-N is a natural polymer.

Synthesis of Buna-S needs nascent oxygen.

Buna-S is a synthetic and linear thermosetting polymer.

Neoprene is an addition copolymer used in plastic bucket manufacturing.

Sulphur

Styrene

Strength

Sulphonation

(a) → (iv), (b) → (iii), (c) → (ii), (d) → (i)

(a) → (iii), (b) → (iv), (c) → (i), (d) → (ii)

(a) → (ii), (b) → (i), (c) → (iv), (d) → (iii)

(a) → (i), (b) → (ii), (c) → (iii), (d) → (iv)