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The repeating unit present in Nylon 6 is...

The repeating unit present in Nylon 6 is :

A

`- [NH(CH_2)_5 NHCO(CH_2)_4CO]-`

B

`-[CO(CH_2)_5NH]-`

C

`-[CO(CH_2)_4NH]-`

D

`-[NH(CH_2)_4NHCO(CH_2)_6CO]-`

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The correct Answer is:
B
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