Final answer:
Among CH3Br, CH3Cl, CH3F, and CH3, CH3Br will react most rapidly with acidified silver nitrate to produce a silver halide precipitate because the carbon-bromine bond is weaker and therefore breaks more easily.
Step-by-step explanation:
The reaction speed will be significantly impacted by the nature of the halogen. The rate of reaction tends to increase as we move down the halogen group in the periodic table due to decreasing bond strengths. Therefore, CH3Br will react most rapidly to produce a silver halide precipitate with acidified silver nitrate among all the options given. This is because the carbon-bromine bond in CH3Br is weaker than the carbon-chlorine and carbon-fluorine bonds in CH3Cl and CH3F respectively, allowing it to break more easily and react more rapidly.
Learn more about Chemical Reaction Rates