For the gas A, $a=0$ and its dependence on P is linear at all pressure.

For the gas $\mathrm{B}, b=0$ and its dependence on P is linear at all pressure.

For the gas C , which is typical real gas for which neither $a=0$ nor $b=0$. By knowing the minima and the point of intersection, with $Z=1, a$ and $b$ can be calculated.

At high pressure, the slope is positive for all real gases.

Two different oximes are formed.

Three different oximes are formed.

Two oximes are optically active.

All oximes are optically active.

6,6

6,4

4,4

3,3