Iodomethane (CH3I) is a commonly used reagent in organic chemistry. When used properly, this reagent allows chemists to introduce methyl groups in many different, useful applications. The chemical does pose a risk as a carcinogen, possibly owing to iodomethane€™s ability to react with portions of the DNA strand (if they were to come in contact). Consider the following hypothetical initial rates data:

Which of the following could be a possible mechanism to explain the initial rate data? Mechanism I DNA + CH3I †’ DNA€“CH3+ + I2
Mechanism II CH3I †’ CH3+ + I2 Slow
DNA + CH3+ †’ DNA€“CH3+ Fast

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[DNAļo [CHIJo Initial Rate 0.100 0.100 0.200 0.100 0.200 0.200 3.20× 10-4 6.40 × 10-4 1.28 × 10-3