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Explanation:- The one who lives 7th floor is immediate above the one, who lives immediate below the one who likes Sony. So the one who likes Sony lives on 7th floor. T lives on one of the floors below Q, but does not live on the lowermost floor. There are three persons between Q and T. So here we get two cases one when Q lives on 6th floor and the other when Q lives on 7th floor. Case 1:- Only one person lives between Q and the one who likes Titan .The one who likes Boat lives on one of the even-numbered floors above the one who likes Titan . Only two persons live between V and the One who likes Titan . Here we get further two more cases so we hold this case and move further with the other one case. 
Case 2:- Only one person lives between Q and the one who likes Titan .The one who likes Boat lives on one of the even-numbered floors above the one who likes Titan . Only two persons live between V and the One who likes Titan .The one who likes Rolex lives immediately above V. P lives immediately above U and does not like Titan. The one who likes Citizen lives on the odd-numbered floors below U. so only one place left for Citizen i.e. 1st floor. And for P and U 6th and 5th floor respectively. S lives on one of the floor above R. so one place left for R is 1st floor. Now, The one who likes Lava lives immediate above the one who likes Tissot.Only one person lives between the one who likes Tissot and the one who likes Casio. S does not likeTissot. So, only one place left for Tissot i.e. 2nd floor. The one who likes Realme lives immediate above the one who likes Oppo.The one who likes Oppo lives below the one who likes Nokia. So, only one place left for realme and Oppo i.e. 2nd and 1st floor respectively, while U does not like Oneplus and Vivo. So U likes Nokia and P likes Oneplus. 
Therefore, this is the final arrangement.
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