Vineet is taller than Raman but shorter than Jyoti. Sumit is the shortest. Deepak is taller than Sumit but shorter than Raman. Who is the tallest?

Let's represent the height relationship using the '>' symbol (where A>B means A is taller than B):
"Vineet is taller than Raman but shorter than Jyoti":

Jyoti>Vineet>Raman
"Sumit is the shortest": Sumit will be at the end of the chain.

"Deepak is taller than Sumit but shorter than Raman":

Raman>Deepak>Sumit
Combining all these observations together:

Jyoti>Vineet>Raman>Deepak>Sumit
From this arrangement, it is clear that Jyoti is the tallest.