Is first one incorrect? If so, then and why there should be to? And what respond would be?
Where did you disappear?
Where did you disappear to?
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Sign up to join this communityAnswer: He disappeared in the woods.
Answer: I went out jogging
disappear to is used in colloquial spoken language to mean: go, when it seems that a person has "disappeared". Indeed, they have disappeared from the view of the speaker.