JEE Advanced 2020 Full Test 6 Paper 2

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Ligands are broadly classified into two classes classical and non-classical ligands, depending on their donor and acceptor ability. Classical ligands form classical complexes while non-classical ligands form non-classical complexes. Bonding mechanism in non-classical is called synergic bonding:
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Question : 36 of 54
 
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In compound [M(CO)n]z, the correct match for highest ′M−C′ bond length for given M,n and z respectively:
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