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 CFSE.
when the central metal ion has pseudo NOBLE gas electron configuration ,i.e,(n-1)`d^(10)ns^(0)NP^(0)`

Solution :Tetrahedral complexes as favoured by steric requirements, either simple electrostatic repulsion of charge ligands or vander wall's repulsion of large one.
Tetrahedral complexes are thus generally favoured by large ligands like `Cl^(-),Br^(-),I^(-) and PPh_(3)` and metal ions of three types,
(1) those with a noble gas configuration such as `Be^(2+)(ns^(º))`,
(2) those with pseudo noble gas configuration `(n-1)d^(10)ns^(0)np^(0)`, such as `Zn^(2+),Cu^(+) and Ga^(3+)`, and
(3) those transition metal ions which do not strongly favour other structure by virtue of the CFSE, such as `Co^(2+),d^(7)`.


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