Which of the following metals from polynuclear complex ?

Options

A. Ti
B. V
C. Cr
D. Mn

Answer

D

Explanation

Odd electron complexes may achieve stability by accepting an electron. For example, `V(CO)_(6)` is a 17 electron species. It readily completes form a reducing agent.
`V(CO)_(6) + Na rarr Na^(+) [V(CO)_(6)]^(-)`
`17 bar e` `18 bar e`
Other old electerons species acquire an additional electron by dimerzing with another molecule. For example, `Mn(CO)_(5)` has 17 electrons. Two molecules 'share' their odd electron in order to form a Mn-Mn bond. Consequently each Mn becomes an 18 electron species.
`2Mn(CO)_(5) rarr Mn_(2)(CO)_(10)`
`17 bar e` `18 bar e`
Cobalt has an odd number of electrons, so the carbonyl compound `Co(CO)_(8)` has 17 electrons and dimerizes to givec `CO_(2)(CO)_(8)` .