How many double bonds are present in the...

How many double bonds are present in the repeating structural units of polythene?

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The correct Answer is:

Zero. The repeating structural unit of polythene is `-CH_2CH_(2)-` . It has no double bond.

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The repeating structural unit of silicone is

`SiO_(2)`

`overset(R) overset(|)underset(R) underset(|)(S)i-O-`

`overset(R)overset(|)(O)-overset(|)underset(R)underset(|)(Si)-O-`

`-overset(|)underset(R)underset(|)(Si)-O-O-R`

Chloroprene

Chloropicrin

Chloroethane

Chlorotrifluoroethylene

`{:(-CH-,CH-),(" |","|"),(""CH_3,C_6H_5):}`

`{:(-CH_2-,CH-,CH-CH_2-),(,"|","|"),(,C_6H_5,C_6H_5):}`

`{:(-CH_2-,CH-CH_2-,CH-),(,"|","|"),(,C_6H_5,C_6H_5):}`

`{:(-,CH-CH_2-CH_2-,CH-),(,"|","|"),(,C_6H_5,C_6H_5):}`