Which of the following exhibits moderate electrical conductivity?

$A$ polaroid is placed at $45^{\circ}$ to an incoming light of intensity $I_0$. Now,the intensity of light passing through the polaroid after polarization would be:

Find the binomial probability distribution whose mean is $3$ and variance is $2$.

Which of the following bonds is the strongest?

If the sum of the roots of the equation $x^2 + px + q = 0$ is three times their difference,then which of the following is true?

In Gattermann reaction,a diazonium group is replaced by $\underline{X}$ using $\underline{Y}$. $\underline{X}$ and $\underline{Y}$ are:
$\underline{X} \quad \underline{Y}$