Question

A grignard reagent can not be made by reacting magnesium with

• A. Ethyl iodide
• B. Methyl amine
• C. Butyl bromide
• D. Propyl chloride

Answer 1

The correct option is B Methyl amine

Magnesium can be reacted with alkyl halides or aryl halides to form Grignard reagents. The organic halide is added to a magnesium suspension in an dry ether solvent. It is important to note that the reagent can be made with alkyl chlorides, bromides, and iodides but not with fluorides. A grignard reagent is an extremely powerful nucleophile and can react with electrophiles like carbonyl compounds. Hence, the correct answer is option (b) as all the other options are examples of alkyl halides.