Final answer:
The student seems to inquire about the reaction of a Grignard reagent with a ketone, leading to the formation of a secondary alcohol after hydrolysis.
Step-by-step explanation:
The student has asked for the completion of a chemical reaction that involves an organomagnesium compound (which seems to be incorrectly written as MgBr-R) reacting with a ketone. Unfortunately, the chemical compound 'MgBr-R' is not correctly formulated, and it is likely that the student intended to refer to an organomagnesium compound such as a Grignard reagent, which is typically denoted as R-MgBr.
In a standard reaction, a Grignard reagent would react with a ketone to form a secondary alcohol after hydrolysis. Based on a typical Grignard reaction with a ketone, the completion of the reaction would be:
R-MgBr + Ketone → 3° Alcohol (after hydrolysis)