Which of these a grammatically correct sentence ? 1. Which song you have selected 2.Which song have you selected?

.Which song have you selected?

#2 is right!

To form questions, the first auxiliary goes before the subject. In this case, "have" moves before "you" to form the question.
If there is no auxiliary, you insert "do" and make it agree in number and tense:
What do you select?
What does he select?
What did she select?

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