Karachi is the city _____ Quaid e Azam was born in 1876

The correct word to complete the sentence is where. The sentence becomes Karachi is the city where Quaid e Azam was born in 1876. The word where is a relative adverb used to refer to place in a sentence. While is used to show time which would not make sense here. Which and whom are relative pronouns but they cannot correctly indicate a place. Understanding the correct use of relative adverbs and pronouns is important for sentence construction. Therefore the right choice is where because it points to Karachi as the location of Quaid e Azam birth.