While Ti^ 3+ , V^ 3+ , Fe^ 3+ and Co^ 2+ afford a large number of tetrahedral complexes, Cr^ 3+ never does this, the reason being

JEE Advanced Chemistry question

While , , and afford a large number of tetrahedral complexes, never does this, the reason being

(A) forces high crystal field splitting with a variety of ligands
(B)Crystal field stabilization energy in octahedral vis-à-vis tetrahedral system plays the deciding roleCorrect
(C)The ionic radius of is the largest among the other ions mentioned
(D)Electronegativity of is the largest among these trivalent 3d-metals and so chromium prefers to be associated with as many ligands as its ionic radius permits

Answer: (B)

Solution

is , a configuration that gains an exceptionally large crystal field stabilisation energy in an OCTAHEDRAL field (, CFSE , the maximum possible fractional stabilisation for any configuration in a weak or strong field alike) compared to the much smaller CFSE it would gain

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Question ID VK-160083