Which of the following compounds is considered as a Grignard reagent?

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Multiple Choice

Which of the following compounds is considered as a Grignard reagent?

Explanation:
Grignard reagents are organomagnesium halides of the form RMgX, created by reacting an alkyl or aryl halide with magnesium in dry ether solvents. The carbon attached to magnesium is highly nucleophilic, so these reagents add to carbonyl compounds and then are hydrolyzed to give alcohols or other products. The compound that fits this description is a methylmagnesium chloride, RMgX with R as CH3 and X as Cl. That exactly matches a Grignard reagent. The others don’t fit: an alcohol (CH3CH2OH) would donate a proton to the Grignard, quenching it; an organolithium (CH3Li) is a similar reagent family but not a Grignard reagent; and a sodium bisulfite salt (NaHSO3) is not an organomagnesium compound at all.

Grignard reagents are organomagnesium halides of the form RMgX, created by reacting an alkyl or aryl halide with magnesium in dry ether solvents. The carbon attached to magnesium is highly nucleophilic, so these reagents add to carbonyl compounds and then are hydrolyzed to give alcohols or other products.

The compound that fits this description is a methylmagnesium chloride, RMgX with R as CH3 and X as Cl. That exactly matches a Grignard reagent.

The others don’t fit: an alcohol (CH3CH2OH) would donate a proton to the Grignard, quenching it; an organolithium (CH3Li) is a similar reagent family but not a Grignard reagent; and a sodium bisulfite salt (NaHSO3) is not an organomagnesium compound at all.

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