Identify the solvate isomer pair among four pairs of cobalt and chromium complexes

1. A.
   $\left\lbrack Cr\left( H_{2}O \right)_{6} \right\rbrack{Cl}_{3}$ and $\left\lbrack Cr\left( H_{2}O \right)_{5}Cl \right\rbrack{Cl}_{2} \cdot H_{2}O$
2. B.
   $\left\lbrack Co\left( {NH}_{3} \right)_{5}{SO}_{4} \right\rbrack Br$ and $\left\lbrack Co\left( {NH}_{3} \right)_{5}Br \right\rbrack{SO}_{4}$
3. C.
   $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Cr(CN)_{6} \right\rbrack$ and $\left\lbrack Cr\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Co(CN)_{6} \right\rbrack$
4. D.
   $\left\lbrack Fe\left( H_{2}O \right)_{5}SCN \right\rbrack^{+}$and $\left\lbrack Fe\left( H_{2}O \right)_{5}NCS \right\rbrack^{+}$

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1. A.
   $\mathrm{[Co(NH_3)_5(NO_2)]^{2\oplus}}$ and $\mathrm{[Co(NH_3)_5(ONO)]^{2\oplus}}$
2. B.
   $\mathrm{[Co(NH_3)_5SO_4]Br}$ and $\mathrm{[Co(NH_3)_5Br]SO_4}$
3. C.
   $\mathrm{[Co(NH_3)_6][Cr(CN)_6]}$ and $\mathrm{[Cr(NH_3)_6][Co(CN)_6]}$
4. D.
   $\mathrm{[Cr(H_2O)_6]Cl_3}$ and $\mathrm{[Cr(H_2O)_5Cl]Cl_2 \cdot H_2O}$

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