Hello friend, In SCJP 1.4, there won't be any question regarding unreachable code. I am not sure about the SCJP 5.0 exam. I finished the 1.4 exam last month and there were no questions on that. Further, i took some mock exams and didn't find any questions on unreachable code.
God is great. Friendship is double great. Mathavan SCJP 1.4 SCWCD (preparing)