Which of the following is not used as a biopesticide?

$Assertion:$ The total translational kinetic energy of all the molecules of a given mass of an ideal gas is $1.5$ times the product of its pressure and its volume.
$Reason:$ The molecules of a gas collide with each other and the velocities of the molecules change due to the collision.

$DDT$ residues are rapidly passed through food chain causing biomagnification because $DDT$ is:

The pair of gases responsible for acid rain are

The work function of a metallic surface is $5.01 \ eV$. The photo-electrons are emitted when light of wavelength $2000 \ \mathring{A}$ falls on it. The potential difference applied to stop the fastest photo-electrons is .............. $volts$ $[h = 4.14 \times 10^{-15} \ eV \cdot s]$

$\int \frac{dx}{(x+1) \sqrt{4x+3}}$ is equal to