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Question

The common features among the species CN,CO and NO+ are


  1. Bond order three and isoelectronic

  2. Bond order three and weak field ligands

  3. Bond order two and -acceptors

  4. Isoelectronic and weak field ligands


Solution

The correct option is A

Bond order three and isoelectronic


First, we have to draw energy level diagram of CN, CO and NO+ are and we will write the electronic configuration of all molecules.

CN(σ1s)2(σ1s)2(σ2s)2(σ2s)2(π2px2π2py2)(π2pz2)

CO(σ1s)2(σ1s)2(σ2s)2(σ2s)2(π2px2π2py2)(π2pz2)

NO+(σ1s)2(σ1s)2(σ2s)2(σ2s)2(π2px2π2py2)(π2pz2)

[Note:Because number of electrons > 15,that's why in 2p orbitals, π2pxπ2py will be filled first then σ2pz]

Now,number of electrons in case of:

             CN=6+7+1=14

             CO=6+8=14

             NO+=7+81=14

Bond order of:

CN=12[BOABO]=12[104]=62=3

CO=12[BOABO]=12[104]=62=3

NO+=12[BOABO]=12[104]=62=3

Therefore, All three are isoelectronic and bond order = 3

Option (b) and (d) can be discarded because, all three are not weak field ligands.

Low field Ligands are all π - donors

 High field Ligands are all π - acceptors

I<Br<S2<SCN<Cl<NO3<N3<F<OH<C2O42<H2O<NCS<CH3CN
<pyridine<NH3<ethylenediamine<(2,21bipyridine<(1,10phenanthroline)<NO2<PPh3<CN<CO

Therefore, we can see CN & CO are not weak field Ligands.

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