Answer:
The best options are "C & D"
C: The Grignard reagent is an example of an organometallic compound.
D: Once prepared, a Grignard reagent should be used quickly
Step-by-step explanation:
Grignard reagent is a highly reactive organomagnesium compound formed by the reaction of a haloalkane with magnesium in an ether solvent.Grignard reagents are useful for forming carbon–heteroatom bonds.
With formula RMgX
X is a halogen and R is an alkyl or aryl.