JEE Main · 2009 · 12 Apr 2009 · Offline · Polymers

Buna-N synthetic rubber is a copolymer of :

(A)(see structure) and $H_{2} C = CH - CH = CH_{2}$
(B) $H_{2} C = CH - CH = CH_{2}$ and $H_{5} C_{6} - CH = CH_{2}$
(C) $H_{2} C = CH - CN$ and $H_{2} C = CH - CH = CH_{2}$ ✓ Correct
(D) $H_{2} C = CH - CN$ and (see structure)

Answer: (C)

Solution

Buna-N, the oil-resistant nitrile rubber, is made by copolymerising buta-1,3-diene,

H_{2} C = CH - CH = C H_{2}

, with acrylonitrile,

H_{2} C = CH - CN

. The letter N in the name points to the nitrile group contributed by the acrylonitrile, so the correct pair of monomers is acrylonitrile together with butadiene.

JEE Main · 2009 · 12 Apr 2009 · Offline · Single correct option

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