The question is this:

2-Phenyl-2-Butanol can be synthesized by three different combinations of a grignard reagent and a ketone. Show each combination.

I can only think of one.

1. Butanone with Br-Mg-Ph

I can't think of anything else.

I'm not too sure if this will work:

phenylbutanone withe Br-Mg-Me

now i'm stuck. i can't think of the last one.