Hey there!:
1 - True: Grignard reagents tend to act as Bronsted bases.
2 - False: Grignard reagents decompose rapidly in anhydrous ether solutions
3 - True : A Grignard reagent contains nucleophilic carbon.
4 - False: Once prepared , a Grignard reagent can be easily stored, and need not be used quickly.
5 - True : The Grignard reagent is an example of an organometallic compound.
Hope that helps!