The vander waals constant for gases `A,B` and `C` are as follows:
`{:(Gas,a//dm^(6)KPa mol^(-2),b//dm^(3) mol^(-1)),(A,405.3,0.027),(B,1215.9,0.030),(C,607.95,0.032):}`
Which gas has
(i) Highest critical temperature
(ii) The largest molecular volume
(iii) Most ideal behaviour around `STP`?

Explanation

To solve the given problem, we will analyze the Van der Waals constants \( A \) and \( B \) for the gases \( A \), \( B \), and \( C \) to find out which gas has the highest critical temperature, the largest molecular volume, and the most ideal behavior around STP.

### Step 1: Calculate the Critical Temperature
The critical temperature \( T_c \) can be calculated using the formula:
\[ T_c = \frac{8A}{27RB} \]
where \( R \) is the universal gas constant (approximately \( 8.314 \, \text{dm}^3 \cdot \text{KPa} \cdot \text{mol}^{-1} \cdot \text{K}^{-1} \)).
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