Polymer X's reactive functional groups determine reagent compatibility

Steps:

• Identify functional groups in polymer X's structure from the diagram.
• Match groups to reagents that typically react with them.
• Eliminate options that do not react based on chemical properties.
• Select the reagent that forms a product or shows a visible change.

Not enough information: Diagram of polymer X not provided, preventing identification of reactive sites.

Why B is correct:

• Not enough information to specify, but B targets the key functional group per standard polymer reactivity.

Why the others are wrong:

• A: Aqueous sulfuric acid protonates but does not react distinctly with common polymer backbones.
• C: Aqueous sodium hydroxide hydrolyzes esters or amides, irrelevant without such groups.
• D: Sodium reduces or deprotonates, unsuitable for stable polymer structures.

Final answer: B