JEE Advanced 2018 Chemistry question

The correct statement(s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)

(A)Total number of valence shell electrons at metal centre in or is 16
(B)These are predominantly low spin in natureCorrect
(C)Metal–carbon bond strengthens when the oxidation state of the metal is loweredCorrect
(D)The carbonyl C−O bond weakens when the oxidation state of the metal is increased

Answer: (B),(C)

Solution

(A) Fe(0) has 8 valence electrons + 5 × 2 from CO = 18; Ni(0) has 10 + 4 × 2 = 18, not 16: false. (B) CO is a strong-field -acceptor ligand, so these complexes are low spin (in fact diamagnetic): true. (C) A lower oxidation state means more electron density

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Question ID VK-026719