Rohit is taller than Punit but shorter than Mayank. Rohan is the shortest and Mohan is taller than Rohit but not the tallest. Who is tallest?

Let's convert the given statements into height relationships:
Rohit is taller than Punit but shorter than Mayank:

Mayank>Rohit>Punit
Rohan is the shortest:

Rohan is at the absolute bottom.
Mohan is taller than Rohit but not the tallest:
This implies Mohan is taller than Rohit, but since he is not the tallest, Mayank remains the tallest.

Mayank>Mohan>Rohit
Combining all information from tallest to shortest:

Mayank>Mohan>Rohit>Punit>Rohan
Thus, Mayank is the tallest.