Coal tar is the main source of

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

The absolute value of the tangent of the difference of the angles made by the lines $4x^2 - 24xy + 11y^2 = 0$ with the $X$-axis is

The discovery of the fungicide known as Bordeaux mixture is associated with which of the following diseases?

Two soap bubbles of radii $r_1 = 4 \, cm$ and $r_2 = 5 \, cm$ are touching each other over a common surface $S_1S_2$ (as shown in the figure). The radius of curvature of this common surface will be ....... $cm$.

Identify the chiral molecule from the following.