MCQ
Aryl fluoride may be prepared from arene diazonium chloride using
- ✓$HB{F_4}/\Delta $
- B$HB{F_4}/NaN{O_2},Cu,\Delta $
- C$CuF/HF$
- D$Cu/HF$

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$(A)\,\,\,\,[Ni(H_2O)_5NH_3]^{2+},$
$(B)\,\,\,\,[Ni(H_2O)_4(NH_3)_2]^{2+}$ and
$(C)\,\,\,\,[Ni(H_2O)_3(NH_3)_3]^{2+}$ is

Electron geometry $-$ Possible molecular shape from respective electron geometry
