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Coordination Compounds · Question 64

AIPMT 2011 (Prelims)MCQMedium📈 Topic in 25% papers+4−1
1

Which of the following carbonyls will have the strongest C–O bond?

  1. Mn(CO)6+
  2. Cr(CO)6
  3. V(CO)6-
  4. Fe(CO)5

Answer

(1) Mn(CO)6+

Solution

As per NCERT, the metal–carbon bond in metal carbonyls has both and character; the bond is formed by donation of electrons from a filled metal d orbital into the vacant antibonding * orbital of CO (back bonding).

More back bonding more electron density in * of CO weaker C–O bond.

Back bonding decreases as the electron density on the metal decreases:

V(CO)6- > Cr(CO)6 > Mn(CO)6+ (isoelectronic series, charge -1, 0, +1)

Mn(CO)6+, with a positive charge on the metal, has the least back bonding and hence the strongest C–O bond.

Answer: (1)

AIPMT 2011 (Prelims)

Keep practising — Coordination Compounds

2

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

  1. [Ti(NH3)6]3+
  2. [Cr(NH3)6]3+
  3. [Co(NH3)6]3+
  4. [Zn(NH3)6]2+
AIPMT 2011 (Prelims)
3

Which of the following complex ions is not expected to absorb visible light?

  1. [Ni(CN)4]2-
  2. [Cr(NH3)6]3+
  3. [Fe(H2O)6]2+
  4. [Ni(H2O)6]2+
AIPMT 2010 (Prelims)
4

Crystal field stabilization energy for high spin d4 octahedral complex is

  1. -1.8 0
  2. -1.6 0 + P
  3. -1.2 0
  4. -0.6 0
AIPMT 2010 (Prelims)
5

The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to

  1. linkage isomerism
  2. geometrical isomerism
  3. coordination isomerism
  4. ionization isomerism.
AIPMT 2010 (Prelims)
6

Which one of the following complexes is not expected to exhibit isomerism?

  1. [Ni(NH3)4(H2O)2]2+
  2. [Pt(NH3)2Cl2]
  3. [Ni(NH3)2Cl2]
  4. [Ni(en)3]2+
AIPMT 2010 (Prelims)
7

Which of the following does not show optical isomerism? (en = ethylenediamine)

  1. [Co(NH3)3Cl3]0
  2. [Co(en)Cl2(NH3)2]+
  3. [Co(en)3]3+
  4. [Co(en)2Cl2]+
AIPMT 2009
8

Which of the following complex ions is expected to absorb visible light? (At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

  1. [Ti(en)2(NH3)2]4+
  2. [Cr(NH3)6]3+
  3. [Zn(NH3)6]2+
  4. [Sc(H2O)3(NH3)3]3+
AIPMT 2009
9

Which of the following complexes exhibits the highest paramagnetic behaviour? where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties. (At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)

  1. [Co(ox)2(OH)2]-
  2. [Ti(NH3)6]3+
  3. [V(gly)2(OH)2(NH3)2]+
  4. [Fe(en)(bpy)(NH3)2]2+
AIPMT 2008
10

In which of the following coordination entities the magnitude of o (CFSE in octahedral field) will be maximum? (At. No. Co = 27)

  1. [Co(CN)6]3-
  2. [Co(C2O4)3]3-
  3. [Co(H2O)6]3+
  4. [Co(NH3)6]3+
AIPMT 2008
11

Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2)

  1. [Cr(NH3)6][Co(CN)6]
  2. [Co(en)2Cl2]Cl
  3. [Pt(NH3)4][PtCl6]
  4. [Co(NH3)4Cl2]NO2
AIPMT 2007

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