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How do Grignard reagents react?

Answer 1

With carbonyl species it usually reacts quantitatively.

Grignards generally do not react well with alkyl halides, though the addition of copper salts can occasionally mediate such a reaction; see here for a related question, which dealt with the action of Grignards on ketones and aldehyes.

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Answer 2

Christian Anderson

Grignard reagents react by donating their alkyl or aryl group to electrophiles, forming a new carbon-carbon bond. This reaction proceeds through the nucleophilic addition of the Grignard reagent to the electrophilic carbon atom of the substrate, followed by proton transfer or quenching with a suitable acidic or protic solvent.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.