Crappy and Unacceptable unless you are interviewing for the COO position: I want to be the CEO of this company. I know that by starting in the entry level and working hard, I can someday be the CEO.

As great as this sounds, it just isn't realistic or believable for any company. It may be believable in your reality, but at the end of the day we are working with the recruiter's and the hiring manager's reality. If they don't see them becoming the CEO (and they don't) why should they think you have a shot?

Answer with Example: My long-term goal is to be an expert in my discipline. I would like to be the "go to" person for what I do. When there is a problem, people think of me when it comes to solving that. I don't worry about the title so much as having a rounded skill set. I want to be effective not only internally within the company but also externally with clients both large and small. I know it will take a lot of work, but if it was easy, everyone would do it.