What is the final product obtained by the reduction of glycerol with hydriodic acid $(HI)$?

If $(2,-1,3)$ is the foot of the perpendicular drawn from the origin to the plane, then the equation of the plane is

$A$ certain mass of a gas occupies a volume of $2 \ L$ at $STP$. To what temperature must the gas be heated to double its volume,keeping the pressure constant?

Which one of the following represents the graph between $\log p$ (on $Y$-axis) and $\frac{1}{T}$ (on $X$-axis)?
($p=$ vapour pressure of a liquid,$T=$ absolute temperature)

What does the given structural formula represent?

The solution of $\tan y \frac{dy}{dx} = \sin(x+y) + \sin(x-y)$ is