NEET 2004 Chemistry question

is a strong field ligand. This is due to the fact that :-

(1)It is a pseudohalide
(2)It can accept electrons from metal speciesCorrect
(3)It forms high spin complexes with metal species
(4)It carries negative charge

Answer: (2)

Solution

has vacant antibonding orbitals; besides donating a lone pair to the metal (sigma bond) it accepts electron density from filled metal d orbitals by back-bonding (-acceptor behaviour). This synergic bonding gives a large crystal-field

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Question ID VK-089408