how does grignard reagent react with organic acid?

Question

grig reagent is RMgX.when this group approaches COOH,
i am not able to understand how R is eliminated from RMgX and then MgX combines with COO-.R has an ionic character with Mg!!!!

Answer 1

you appear to be confused, when a grignard reagent reacts with a carbonyl carbon (such as in RCOOH) the R of RMrBr (the most common grig) is bonded to the carbon. however when the electrons move up the oxygen to form RCO- OH, the remaining MrBr+ ion interacts with this O- forming a salt, i believe this reacts further, eliminating the OH. hope this was clear enough.

Answer 2

Yes, actually the Grignard reagent is R- Mg+ X-