1.

Which of the following is Buna -N

Answer»

`-[CH_2-CH=CH-CH_2-CH_2-OVERSET(C_6H_5)overset(|)CH]_n-`
`-[CH_2-CH=CH-CH_2-CH_2-overset(CN)overset(|)CH]_n-`
`-[CH_2-CH_2-CH_2-CH_2-CH_2-overset(CN)overset(|)CH]_n-`
`-[CH_2-CH_2-CH=CH-CH_2-overset(CN)overset(|)CH]_n-`

ANSWER :B


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