You cannot parameterize column names in a query, so I think that this is the reason for the errors you are seeing.
If these 'questions' do not have some associated 'Question' table, I'd suggest that you create one and do some normalising. Even if you cannot change the design of the source data, you can do something to post-fix it for your own purposes, in your ETL.
If you haven't even tried to resolve your issue, please don't expect the hard-working volunteers here to waste their time providing links to answers which you could easily have found yourself.