The major product in the following reaction is:

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Canvas Classes · Accepted Answer

The given reaction describes the alkylation of adenine using methyl iodide () in the presence of a base.
Adenine has several nitrogen atoms, but the most acidic proton is strategically located on the N9 position of the imidazole ring. The base deprotonates N9, generating a nucleophilic purine anion which then undergoes an  substitution reaction attacking the methyl iodide.
Thus, the major alkylation product is 9-methyladenine, corresponding to structure (b) where the methyl group is attached to

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