Answer to Question #107062 in Organic Chemistry for Itumeleng

Question

Treatment of cyclopentane-1,3-dione with a base followed by addition of
methyl iodide affords a mixture of 2-methylcyclopentane-1,3-dione, 2,3-
dimethylcyclopentane-1,3-dione and 3-methoxy-2-cyclopenten-1-one.
Explain with the aid of mechanism how each product is formed

Answer 1

cyclopentane-1,3-dione ----(base + methyl iodide)----2-methylcyclopentane-1,3-dione+ 2,3-dimethylcyclopentane-1,3-dione + 3-methoxy-2-cyclopenten-1-one. 

When a base followed by methyl iodide was added to cyclopentane-1,3-dione one hydrogen was displaced and was replaced by a methyl group.