$A$ group of species with a common ancestor is known as:

The active mass of $64 \ g$ of $HI$ in a $2 \ L$ flask is:

Two plants can be conclusively said to belong to the same species if they

$CH_3MgBr + CO_2$ $\xrightarrow{\text{Dry ether}} Y$ $\xrightarrow{H_3O^{\oplus}} Z$. Identify $Z$ from the following.

The cut flowers and vegetables can be kept fresh for a long period by this plant hormone.

$A$ beam of monochromatic light is incident at $i = 50^{\circ}$ on one face of an equilateral prism. If the angle of emergence is $e = 40^{\circ}$,then the angle of minimum deviation is: