MCQ
Which of the following are meso compound?


- A$A, B, C, D$
- B$B, C, D$
- C$A, C, D$
- ✓$A, B, D$

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| gas | $Ar$ | $Ne$ | $Kr$ | $Xe$ |
| $a /\left( atm \,dm ^{6} \,mol ^{-2}\right)$ | $1.3$ | $0.2$ | $5.1$ | $4.1$ |
| $b /\left(10^{-2} \,dm ^{3}\, mol ^{-1}\right)$ | $3.2$ | $1.7$ | $1.0$ | $5.0$ |
Which gas is expected to have the highest critical temperature?
$(I)\, [Ni(CN)_4]^{2-}\,\,\,(II)\, [NiCl_4]^{2-}\,\,\,(III)\,Ni(CO_4)\,\,\,$
$(IV)\, [Ni(H_2O)_6 ]^{2+}$
| List $-I$ (Process) | List $-II$ (Conditions) |
| $A$. Isothermal process | $I$. No heat exchange |
| $B$. Isochoric process | $II$. Carried out at constant temperature |
| $C$. Isobaric process | $III$. Carried out at constant volume |
| $D$. Adiabatic process | $IV$. Carried out at constant pressure |

Reason : Benzene is a solvent for the Friedel- Craft's alkylation of bromobenzene.