1. Both are correct.
2. I would change "in" to "of" in your first (depending on context). The second is correct.
Student or Learner
Hi Mike, thanks for your answer! :)
I have a question would like to ask you. Can you tell me which one is correct?
1.) "Can somebody tell me which sentence is correct?" OR "Can somebody tell me which is the correct sentence?"
2.) "Can you tell me which sentence in the following is correct?" OR "Can you tell me which of the following sentence is correct?"
In the following would work for me if you had a text with mistakes afterwards, but not for a list of sentences.