The basic chemical building block of natural rubber obtained from trees is A. Isoprene B. Vinyl Chloride C. Acetylene D. Neoprene

Isoprene
Vinyl Chloride
Acetylene
Neoprene

The correct answer is A. Isoprene.

Isoprene is a five-carbon hydrocarbon with the chemical formula $C_5H_8$. It is a colorless, flammable liquid that is found in natural rubber and turpentine. Isoprene is also used to make synthetic rubber, latex, and adhesives.

Vinyl chloride is a colorless, flammable gas with the chemical formula $C_2H_3Cl$. It is used to make polyvinyl chloride (PVC), a common plastic.

Acetylene is a colorless, flammable gas with the chemical formula $C_2H_2$. It is used to make plastics, synthetic fibers, and other chemicals.

Neoprene is a synthetic rubber that is made from chloroprene. It is a tough, durable material that is resistant to heat, oil, and chemicals. Neoprene is used to make a variety of products, including gaskets, hoses, and roofing materials.

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