(C) : Complexes in which a sigma bond acts as a two -electron donor to the metal center are called sigma complexes. In $\mathrm{Al}_{2}\left(\mathrm{CH}_{3}\right)_{6}$, all $-\mathrm{CH}_{3}$ group attached with the $\mathrm{A}_{1}$ through the sigma bond. Remaining complex are connect with the metal by coordinate bond.
CG PET- 2013
COORDINATION COMPOUNDS
274277
For the crystal field splitting in octahedral complexes,
1 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
2 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
3 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
4 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
Explanation:
(B) : For the crystal filed splitting in octahedral complexes, the energy of the $e_{g}$ orbital's will increase by $(3 / 5) \Delta_{\mathrm{o}} \approx 0.6 \Delta_{\mathrm{o}}$ and that of the $\mathrm{t}_{2 \mathrm{~g}}$ will decrease by (2\5) $\Delta_{\mathrm{o}} \approx 0.4 \Delta_{\mathrm{o}}$
Karnataka-CET-2021
COORDINATION COMPOUNDS
274278
Among the following complexes the one which shows zero crystal field stabilisation energy (CFSE) is
274279
Arrange the following cobalt complexes in the order of increasing crystal field stabilization energy (CFSE) value. $\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$,
1 A $<$ B $<$ C $<$ D
2 B $<$ A $<$ C $<$ D
3 B $<$ C $<$ D $<$ A
4 C $<$ D $<$ B $<$ A
Explanation:
(A) : The complex contains $-\mathrm{F},-\mathrm{H}_{2} \mathrm{O},-\mathrm{NH}_{3}$ and en ligands. The CFSE of complex depends upon the nature of ligand. Higher the field of ligand, more will be CFSE. The order of field of ligand are $\mathrm{F}<\mathrm{H}_{2} \mathrm{O}<\mathrm{NH}_{3}<$ en. Thus, the order of CFSE will be - $\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
(C) : Complexes in which a sigma bond acts as a two -electron donor to the metal center are called sigma complexes. In $\mathrm{Al}_{2}\left(\mathrm{CH}_{3}\right)_{6}$, all $-\mathrm{CH}_{3}$ group attached with the $\mathrm{A}_{1}$ through the sigma bond. Remaining complex are connect with the metal by coordinate bond.
CG PET- 2013
COORDINATION COMPOUNDS
274277
For the crystal field splitting in octahedral complexes,
1 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
2 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
3 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
4 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
Explanation:
(B) : For the crystal filed splitting in octahedral complexes, the energy of the $e_{g}$ orbital's will increase by $(3 / 5) \Delta_{\mathrm{o}} \approx 0.6 \Delta_{\mathrm{o}}$ and that of the $\mathrm{t}_{2 \mathrm{~g}}$ will decrease by (2\5) $\Delta_{\mathrm{o}} \approx 0.4 \Delta_{\mathrm{o}}$
Karnataka-CET-2021
COORDINATION COMPOUNDS
274278
Among the following complexes the one which shows zero crystal field stabilisation energy (CFSE) is
274279
Arrange the following cobalt complexes in the order of increasing crystal field stabilization energy (CFSE) value. $\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$,
1 A $<$ B $<$ C $<$ D
2 B $<$ A $<$ C $<$ D
3 B $<$ C $<$ D $<$ A
4 C $<$ D $<$ B $<$ A
Explanation:
(A) : The complex contains $-\mathrm{F},-\mathrm{H}_{2} \mathrm{O},-\mathrm{NH}_{3}$ and en ligands. The CFSE of complex depends upon the nature of ligand. Higher the field of ligand, more will be CFSE. The order of field of ligand are $\mathrm{F}<\mathrm{H}_{2} \mathrm{O}<\mathrm{NH}_{3}<$ en. Thus, the order of CFSE will be - $\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
(C) : Complexes in which a sigma bond acts as a two -electron donor to the metal center are called sigma complexes. In $\mathrm{Al}_{2}\left(\mathrm{CH}_{3}\right)_{6}$, all $-\mathrm{CH}_{3}$ group attached with the $\mathrm{A}_{1}$ through the sigma bond. Remaining complex are connect with the metal by coordinate bond.
CG PET- 2013
COORDINATION COMPOUNDS
274277
For the crystal field splitting in octahedral complexes,
1 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
2 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
3 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
4 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
Explanation:
(B) : For the crystal filed splitting in octahedral complexes, the energy of the $e_{g}$ orbital's will increase by $(3 / 5) \Delta_{\mathrm{o}} \approx 0.6 \Delta_{\mathrm{o}}$ and that of the $\mathrm{t}_{2 \mathrm{~g}}$ will decrease by (2\5) $\Delta_{\mathrm{o}} \approx 0.4 \Delta_{\mathrm{o}}$
Karnataka-CET-2021
COORDINATION COMPOUNDS
274278
Among the following complexes the one which shows zero crystal field stabilisation energy (CFSE) is
274279
Arrange the following cobalt complexes in the order of increasing crystal field stabilization energy (CFSE) value. $\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$,
1 A $<$ B $<$ C $<$ D
2 B $<$ A $<$ C $<$ D
3 B $<$ C $<$ D $<$ A
4 C $<$ D $<$ B $<$ A
Explanation:
(A) : The complex contains $-\mathrm{F},-\mathrm{H}_{2} \mathrm{O},-\mathrm{NH}_{3}$ and en ligands. The CFSE of complex depends upon the nature of ligand. Higher the field of ligand, more will be CFSE. The order of field of ligand are $\mathrm{F}<\mathrm{H}_{2} \mathrm{O}<\mathrm{NH}_{3}<$ en. Thus, the order of CFSE will be - $\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
(C) : Complexes in which a sigma bond acts as a two -electron donor to the metal center are called sigma complexes. In $\mathrm{Al}_{2}\left(\mathrm{CH}_{3}\right)_{6}$, all $-\mathrm{CH}_{3}$ group attached with the $\mathrm{A}_{1}$ through the sigma bond. Remaining complex are connect with the metal by coordinate bond.
CG PET- 2013
COORDINATION COMPOUNDS
274277
For the crystal field splitting in octahedral complexes,
1 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
2 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
3 the energy of the $e_{g}$ orbitals will increase by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will increase by $(2 / 5) \Delta_{0}$
4 the energy of the $e_{g}$ orbitals will decrease by $(3 / 5) \Delta_{0}$ and that of the $t_{2 g}$ will decrease by $(2 / 5) \Delta_{0}$
Explanation:
(B) : For the crystal filed splitting in octahedral complexes, the energy of the $e_{g}$ orbital's will increase by $(3 / 5) \Delta_{\mathrm{o}} \approx 0.6 \Delta_{\mathrm{o}}$ and that of the $\mathrm{t}_{2 \mathrm{~g}}$ will decrease by (2\5) $\Delta_{\mathrm{o}} \approx 0.4 \Delta_{\mathrm{o}}$
Karnataka-CET-2021
COORDINATION COMPOUNDS
274278
Among the following complexes the one which shows zero crystal field stabilisation energy (CFSE) is
274279
Arrange the following cobalt complexes in the order of increasing crystal field stabilization energy (CFSE) value. $\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$,
1 A $<$ B $<$ C $<$ D
2 B $<$ A $<$ C $<$ D
3 B $<$ C $<$ D $<$ A
4 C $<$ D $<$ B $<$ A
Explanation:
(A) : The complex contains $-\mathrm{F},-\mathrm{H}_{2} \mathrm{O},-\mathrm{NH}_{3}$ and en ligands. The CFSE of complex depends upon the nature of ligand. Higher the field of ligand, more will be CFSE. The order of field of ligand are $\mathrm{F}<\mathrm{H}_{2} \mathrm{O}<\mathrm{NH}_{3}<$ en. Thus, the order of CFSE will be - $\mathrm{A}<\mathrm{B}<\mathrm{C}<\mathrm{D}$
