Which solvent reduces pollution or waste: water among chlorinated solvents

The same question, asked 2 times: 9 May 2023 S1*, 19 Apr 2025 S2. Every wording below, oldest first.

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Question 1
9 May 2023 S1
59 $Which of the following solvents reduces the environmental pollution?$
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Question 2
19 Apr 2025 S2
89 $Which solvent from following is used in order to avoid creation of waste and pollution of air?$
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