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Coordination Compounds

AIPMT 2004MCQMedium📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2004

Which of the following coordination compounds would exhibit optical isomerism?

  1. Pentaamminenitrocobalt (III) iodide
  2. Diamminedichloroplatinum (II)
  3. trans-Dicyanobis (ethylenediamine) chromium (III) chloride
  4. tris-(Ethylenediamine) cobalt (III) bromide.

Answer

(4) tris-(Ethylenediamine) cobalt (III) bromide.

Solution

A complex shows optical isomerism only when it is chiral, i.e. it has no plane (or centre) of symmetry.

(1) [Co(NH3)5(NO2)]I2 is an octahedral [MA5B] type with planes of symmetry, so it is not optically active.

(2) [Pt(NH3)2Cl2] is square planar, and the molecular plane itself is a plane of symmetry, so it has no optical isomer.

(3) trans-[Cr(CN)2(en)2]Cl has a plane of symmetry in the trans form, so it is optically inactive (only the cis form is chiral).

(4) As per NCERT, [Co(en)3]3+ with three bidentate en ligands is chiral and exists as d and l enantiomers.

Answer: (4)

Keep practising — Coordination Compounds

Ques. 2AIPMT 2004

Among [Ni(CO)4], [Ni(CN)4]2-, [NiCl4]2- species, the hybridisation states at the Ni atom are, respectively [Atomic number of Ni = 28]

  1. sp3, dsp2, dsp2
  2. sp3, dsp2, sp3
  3. sp3, sp3, dsp2
  4. dsp2, sp3, sp3
Ques. 3AIPMT 2004

CN- is a strong field ligand. This is due to the fact that

  1. it carries negative charge
  2. it is a pseudohalide
  3. it can accept electrons from metal species
  4. it forms high spin complexes with metal species.
Ques. 4AIPMT 2004

Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will be (atomic number of Mn = 25)

  1. three
  2. five
  3. two
  4. four
Ques. 5AIPMT 2004

Which of the following does not have a metal carbon bond?

  1. Al(OC2H5)3
  2. C2H5MgBr
  3. K[Pt(C2H4)Cl3]
  4. Ni(CO)4
Ques. 6AIPMT 2004

In an octahedral structure, the pair of d orbitals involved in d2sp3 hybridisation is

  1. dx2-y2, dz2
  2. dxz, dx2-y2
  3. dz2, dxz
  4. dxy, dyz
Ques. 7AIPMT 2004

Which of the following is considered to be an anticancer species?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8AIPMT 2003

Vitamin B12 contains

  1. Fe(II)
  2. Co(III)
  3. Zn(II)
  4. Ca(II)
Ques. 9AIPMT 2003

The number of unpaired electrons in the complex ion [CoF6]3- is (Atomic no. : Co = 27)

  1. 2
  2. 3
  3. 4
  4. zero
Ques. 10AIPMT 2003

Among the following which is not the -bonded organometallic compound?

  1. K[PtCl3( 2-C2H4)]
  2. Fe( 5-C5H5)2
  3. Cr( 6-C6H6)2
  4. (CH3)4Sn
Ques. 11AIPMT 2002

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron?

  1. [Cr(CO)6]
  2. [Fe(CO)5]
  3. [Fe(CN)6]4-
  4. [Cr(NH3)6]3+

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