MCQ
Among the following which one can have a meso form?
- A$CH_3CH(OH)CH(Cl)C_2H_5$
- ✓$CH_3CH(OH)CH(OH)CH_3$
- C$C_2H_5CH(OH)CH(OH)CH_3$
- D$HOCH_2CH(Cl)CH_3$

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$F^-+ H_2O \rightleftharpoons HF + OH^-; K_b$
which relation is correct
$(i)$ $[Cr(NO_3)_3(NH_3)_3]$
$(ii)$ $K_3[Co(C_2O_4)_3]$
$(iii)$ $K_3 [CoCl_2(C_2O_4)_2]$
$(iv)$ $[Co BrCl(en)_2]$