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BITSAT 2023Paper 1
Exam
BITSAT
Year
2023
Paper
Paper 1
Subject
Chemistry
Chapter
Coordination Compounds

BITSAT 2023 · Paper 1 · Chemistry · Coordination Compounds

Among the ligands NH_3 , en, CN^ - and CO the correct order of...

Among the ligands NH3\mathrm{NH}_3, en, CN−\mathrm{CN}^{-} and CO\mathrm{CO} the correct order of their increasing field strength, is :

Options

  1. ANH3<\mathrm{NH}_3 < en <CN−<CO< \mathrm{CN}^{-} < \mathrm{CO}
  2. BCN−<NH3<NH3<\mathrm{CN}^{-} < \mathrm{NH}_3 < \mathrm{NH}_3 < en
  3. Cen <CN−<NH3<CO< \mathrm{CN}^{-} < \mathrm{NH}_3 < \mathrm{CO}
  4. DCO<NH3<\mathrm{CO} < \mathrm{NH}_3 < en <CN−< \mathrm{CN}^{-}

Correct answer

A. NH3<\mathrm{NH}_3 < en <CN−<CO< \mathrm{CN}^{-} < \mathrm{CO}

Step-by-step solution

Ligands can be arranged in a series in the orders of increasing field strength as given below:Weak field ligands:I−<Br−<S2−<SCN<Cl−<N3−,F−<\mathrm{I}^{-} < \mathrm{Br}^{-} < \mathrm{S}^{2-} < \mathrm{SCN} < \mathrm{Cl}^{-} < \mathrm{N}_3^{-}, \mathrm{F}^{-} < Urea, OH < oxalateStrong field ligandsO−−<H2O<NCS−<EDTA <Py,NH3<\mathrm{O}^{--} < \mathrm{H}_2 \mathrm{O} < \mathrm{NCS}^{-} < \text{EDTA } < \mathrm{Py}, \mathrm{NH}_3 < en =SO3−<=\mathrm{SO}_3^{-} < bipy, Phen <NO2−<CH3−<C6H5−<CN−<< \mathrm{NO}_2^{-} < \mathrm{CH}_3^{-} < \mathrm{C}_6 \mathrm{H}_5^{-} < \mathrm{CN}^{-} <CO\mathrm{CO}Such a series is termed as spectrochemical series. It is an experimentally determined series based on the absorption of light by complexes with different ligands.
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