The ratio of minimum wavelengths of Lyman and Balmer series will be

$A$ ball rises to the surface at a constant velocity in a liquid whose density is $4$ times greater than that of the material of the ball. The ratio of the force of friction acting on the rising ball and its weight is

If $f: R \rightarrow C$ is defined by $f(x)=e^{2 i x}$ for $x \in R$, then $f$ is (where $C$ denotes the set of all complex numbers)

What is the $IUPAC$ name of the following compound?

Which of the following is not a class of Bryophytes?