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The ratio of 'pi' bond between monomer u...

The ratio of `'pi'` bond between monomer units of Buna - N is 0.3 x. What is x?

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The correct Answer is:
5
Monomer of Buna-N is , Butadiene - `CH_(2) = CH - CH = CH_(2)`
Aerylo nitrile `-CH_(2) CH - C -= N`, Ratio of `pi` bonds is 2/3 = 1.5 , 0.3(5) = 1.5 , x = 5
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