In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?
C2 → C2+
NO → NO+
O2 → O2+
O2 → O2+
B.
NO → NO+
D.
O2 → O2+
C2 → C2+ electron is removed from bonding molecular orbital so bond order decreases. In NO → NO+, electron is removed from antibonding molecular orbital so bond order increases and nature changes from paramagnetic to diamagnetic.
The absolute configuration of 
S,S
R,R
R,S
R,S
B.
R,R
Which of the following molecules is expected to rotate the plane of plane-polarised light?
A.
Which one of the following has a square planar geometry?
[CoCl4]2-
[FeCl4]2–
[NiCl4] 2–
[NiCl4] 2–
D.
[NiCl4] 2–
27Co2+ - 1s2 2s2 2p6 3s2 3p6 3d7 4s0
As Cl- is weak field ligand so no pairing up.Hence it is sp3 hybridized giving tetrahedral geometry.
Fe2+ - 1s2 2s2 2p6 3s2 3p6 3d6 4s0
Due to Cl-, back pairing is not observed so it will be sp3 hybridized giving tetrahedral geometry.
Ni2+ - 1s2 2s2 2p6 3s2 3p6 3d8 4s0
Because weak ligand, back pairing is not observed so it will be sp3 i.e. tetrahedral geometry.
All the complexes of Pt2+ are square planar including those with weak field ligand such as halide ions
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