Which of the following acids is a vitamin?

Among the following,the strongest base is

A block is sliding down on an inclined plane of slope $\theta$ and at an instant $t = 0$ this block is given an upward momentum so that it starts moving up on the inclined surface with velocity $u$. The distance $(S)$ travelled by the block before its velocity become zero, is . . . . . . . . . . .
($g =$ gravitational acceleration)

Which photosynthetic pigments are present in algae?

$A$ homogeneous equation of second degree in $x$ and $y$ represents which of the following?

Which of the following molecules does not have a linear arrangement of atoms?