Incorrect statement is $({\mathrm{K}}_{\mathrm{H}}$$=\mathrm{Henry}\text{'}\mathrm{s} \mathrm{constant})$

We know that Henry’s law states that the amount of gas that is dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid when the temperature is kept constant.

$\mathrm{P} \propto \mathrm{C} \left(\mathrm{or}\right)$

$\mathrm{P} = {\mathrm{k}}_{\mathrm{H}}.\mathrm{C}$

where $\mathrm{P}=$ Partial pressure 

          ${\mathrm{K}}_{\mathrm{H}}=$ Henry's constant

          $\mathrm{C}=$ Concentration 

And we also know that different gases have different Henry’s laws constant in different solvents

Therefore statement 1 is true.

Now,$\mathrm{P}={\mathrm{k}}_{\mathrm{H}}\mathrm{C}$

And ${\mathrm{K}}_{\mathrm{H}}=\frac{\mathrm{P}}{\mathrm{C}}$

Therefore ${\mathrm{K}}_{\mathrm{H}}$ is inversely proportional to $\mathrm{C}$.

But Concentration is directly proportional to solubility.

Thus, Statement 2 is also true.

and statement 3 is also true.

But statement 4 is false.

Hence option(d) is correct.