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Chemistry Question on coordination compounds

Match List I with List II :List-I Coordination entityList-II Wavelength of light absorbed in nm
A.[CoCl(NH3​)5​]2+[CoCl(NH_3​)_5​]^{2+}
B.[Co(NH3​)6​]3+[Co(NH_3​)_6​]^{3+}
C.[Co(CN)6​]3−[Co(CN)_6​]^{3−}
D.[Cu(H2​O)4​]2+[Cu(H_2​O)_4​]^{2+}
Choose the correct answer from the options given below :
A

A-III, B-II, C-I, D-IV

B

A-II, B-III, C-IV, D-I

C

A-IV, B-I, C-III, D-II

D

A-III, B-I, C-II, D-IV

Answer

A-III, B-II, C-I, D-IV

Explanation

Solution

The correct answer is (A) : A-III, B-II, C-I, D-IV

LIST I Coordination entityLIST II Wavelength of light absorbed in nm
A[CoCl(NH3​)5​]2+[CoCl(NH_3​)_5​]^{2+}
B[Co(NH3​)6​]3+[Co(NH_3​)_6​]^{3+}
C[Co(CN)6​]3−[Co(CN)_6​]^{3−}
D[Cu(H2​O)4​]2+[Cu(H_2​O)_4​]^{2+}

E=hcλ​⇒E∝1λE=\frac{hc}{λ}​⇒E∝\frac{1}{λ}
⇒Δ(CFSE)∝1λabsorb​1​∝⇒Δ(CFSE)∝\frac{1}{λ_{absorb}} ​1​∝ strength of ligand.