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Q.

The IR stretching frequencies of free CO , and  CO  in  [V(CO)6],[Cr(CO)6]0  and  [Mn(CO)6]+ are  2143 cm1,1860 cm1,2000 cm1  and 2090 cm1 , respectively. Then correct statement about metal carbonyls is

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a

MC  ' pi bonding is higher in the cation.

b

CO  ' bond is longer in the cation than in the anion.

c

'  CO   ' bond is weakest in the cation and strongest in the anion.

d

CO  ' bond is strongest in the cation and weakest in the anion.

answer is A.

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Detailed Solution

In metal Carbonyls, 

The higher the negative oxidation state of the central metal Bond length of C−O
                                                                                                           1 1Bond order of CO
                                                                                                                Bond order of M−C bond.

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