Q. In which compound synergic effect is present?
A) $\lbrack Ni(CO)_{4}\rbrack$
B) $\left\lbrack {NiCl}_{4} \right\rbrack^{2 -}$
C) $\left\lbrack {CuCl}_{4} \right\rbrack^{2 -}$
D) $\left\lbrack Mn\left( H_{2}O \right)_{6} \right\rbrack^{2 +}$
Explanation
(a)
The M—C $\pi$-bond in metal carbonyl which is formed by the donation of an electron pair from a filled $d$-orbital of metal into the vacant antibonding $\pi$-orbital of CO, strengthens the M—C $\sigma$— bond. This is called synergic effect and is usually observed in metal carbonyls. Thus $\lbrack Ni(CO)_{4}\rbrack$ exhibits synergic effect.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.