1.

Tetrahedral complexes are generally favoured :

Answer»

where the LIGANDS are bulky
when the ligands are stronger
where the electronic configuration of the central metal is `d^(0)d^(5)" or "d^(10)` (with WEAK field ligands) as there is no CSFE.
when the central metal ion has pseudo noble GAS electron configuration, i.e.`(n-1)d^(10)ns^(0)np^(0).

Answer :A::C


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