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Q.

The correct statements regarding CO and CO2 are

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a

CO is stronger Lewis base than CO2 

b

CO2 is stronger Lewis acid than CO

c

Both CO and CO2 can act as Lewis acids

d

The back bonding in complex compounds with CO increased the stability of the coordination complexes

answer is A, B, C, D.

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Detailed Solution

  • In CO2, C is bonded with two oxygen atoms (electronegative atoms). It is a polar molecule that has a positive center on the carbon atom and can attract (and accept) lone electron pairs. Therefore, it acts as Lewis acid.
  • In CO, C is bonded with one O atom through double bond, C=O and it acts as a Lewis acid in exactly the way your CO 2 molecule did.
  • As partial positive character is more on C in CO2 compared to CO, therefore it is a strong Lewis acid than CO and weaker Lewis base than CO.
  • The sigma bond is formed when a lone pair of electrons of carbonyl carbon is donated to a vacant orbital of metal. To form a pi bond, an electron pair is donated from filled metal d-orbital to vacant anti-bonding pi-orbitals of CO.
  • This weakens the bond between C and O in CO and the bond strength between metal and carbon increases.
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