Reactivity of organic halides with AgNO3 depends on halogen type and bonding

Steps:

• Identify the test: Silver nitrate reacts with halides to form precipitates (AgCl white, AgBr pale yellow, AgI yellow).
• Recall reactivity order: Alkyl iodides > bromides > chlorides due to weaker C-I bond and better leaving group ability.
• Consider bonding: Primary/secondary alkyl halides react faster than aryl/vinyl halides, which don't react easily without special conditions.
• Compare options: Assume A/B/D are less reactive (e.g., chloride or aryl halide), while C is iodide or reactive bromide.

Not enough information: Choices A–D not specified, preventing precise comparison.

Why C is correct:

• C likely features iodide (weakest C-X bond), forming AgI precipitate fastest per bond dissociation energy trend (C-I 238 kJ/mol vs. C-Br 285 kJ/mol, C-Cl 351 kJ/mol).

Why the others are wrong:

• A: Probably chloride, slower due to stronger C-Cl bond.
• B: Likely aryl halide, unreactive as halogen not labile in sp2 carbon.
• D: Possibly vinyl halide, resists substitution without activation.

Final answer: C