Weekly topic: 5 wealth points for those who answer correctly, 2 wealth points for participation； Question 134
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Multiple choice: Food wrap is classified by material into types such as polyethylene (PE) and polyvinyl chloride (PVC). PE plastic wrap can come into direct contact with food, whereas PVC plastic wrap cannot be used in direct contact with food as it poses potential risks to human health. Which of the following statements is incorrect? ( ) A. PE and PVC are both chain-shaped polymers that melt easily when heated. B. The monomers of PE and PVC are both unsaturated hydrocarbons, and they can cause bromine water to fade. C. Burning PVC plastic wrap releases the toxic gas HCl. D. Waste PE and PVC can both be recycled to reduce pollution. Answer: B
The monomers of B, PE, and PVC are all unsaturated hydrocarbons that can decolorize bromine water.
B. The monomers of PE and PVC are both unsaturated hydrocarbons, which can cause bromine water to fade
B. The monomers of PE and PVC are both unsaturated hydrocarbons, which can cause bromine water to fade
B. The monomers of PE and PVC are both unsaturated hydrocarbons, which can cause bromine water to fade
Answer: B. Analysis: Both polyethylene and polyvinyl chloride are linear polymers with thermoplasticity; therefore, option A is correct. PVC contains chlorine, which produces HCl during combustion and is harmful to the human body; therefore, option C is correct. Waste plastics can cause white pollution, and recycling can reduce environmental pollution; therefore, option D is correct. The monomer of PVC contains chlorine atoms and is not a hydrocarbon; therefore, option B is incorrect.
B. The monomers of PE and PVC are both unsaturated hydrocarbons, which can cause bromine water to fade