This is the room where he entered.
This is the room which he entered.
Not being sure of if the first sentence is right, I'm certain that the second one is correct. Could you tell me the grammaticality of the first sentence?
The first suggests that he entered the building through this room. The second suggests that this is the only room he entered (though he may have entered through the front door and walked along the hall and up the stairs to get there).
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The first suggests that he entered the building through this room. The second suggests that this is the only room he entered (though he may have entered through the front door and walked along the hall and up the stairs to get there).