MDCAT Chemistry MCQ #579

In a laboratory SN2 reaction between methyl iodide and NaOH, the initial rate is 0.04 mol/L/s. If the NaOH concentration is increased from 0.1M to 0.4M, what is the new rate?

MDCAT Chemistry MCQ #579

  1. Question 1

    Q1. In a laboratory SN2 reaction between methyl iodide and NaOH, the initial rate is 0.04 mol/L/s. If the NaOH concentration is increased from 0.1M to 0.4M, what is the new rate?

    • A) 0.08 mol/L/s
    • B) 0.16 mol/L/s
    • C) 0.32 mol/L/s
    • D) 0.64 mol/L/s

    Answer: 0.16 mol/L/s

    Explanation: SN2 rate depends on both reactants; quadrupling the nucleophile concentration directly quadruples the rate from 0.04 to 0.16 mol/L/s.