The basic chemical building block of natural rubber obtained from trees is:

acetylene

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vinyl chloride

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isoprene

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neoprene

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Solution

The correct option is C isoprene
Isoprene was first isolated by decomposition of natural rubber. About $95 %$ isoprene production is used to produce cis-polyisoprene - a synthetic version of natural rubber. Natural rubber consists mainly of poly-cis-isoprene.
Hence, isoprene is the correct answer.

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