Which of the following statements about Grignard reagent is false?a)Grignard reagents (RMgBr) add to the carbonyl group of aldehydes and ketonesb)An organosodium compound is not very reactive compared to a Grignard reagentc)Grignard reagents are prepared in ether or tetrahydrofuran (THF)d)Grignard reagents are decomposed by water and alcoholCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Grignard reagents are organometallic compounds that are widely used in organic synthesis. These reagents are prepared by reacting an alkyl or aryl halide with magnesium metal in the presence of anhydrous ether or tetrahydrofuran (THF). The resulting Grignard reagent (RMgX) is a powerful nucleophile that can add to a variety of electrophilic functional groups, including carbonyl groups, epoxides, and halides.

False statement: An organosodium compound is not very reactive compared to a Grignard reagent.

Explanation: This statement is false because organosodium compounds are actually more reactive than Grignard reagents. Organosodium compounds are typically prepared by reacting an alkyl or aryl halide with sodium metal in the presence of anhydrous ether. The resulting organosodium compound (RNa) is a stronger nucleophile than a Grignard reagent and can add to a wider range of electrophiles, including esters, nitriles, and acid chlorides. However, organosodium compounds are also more sensitive to air and moisture than Grignard reagents, which can limit their use in certain reactions.

In summary, Grignard reagents are highly reactive organometallic compounds that can add to a variety of electrophiles, including carbonyl groups. They are typically prepared in ether or THF and are decomposed by water and alcohols. Although organosodium compounds are more reactive than Grignard reagents, they are also more sensitive to air and moisture.

Answer

It is supposed that the Mg-C bond is strongly polar covalent, not ionic. Grignard’s reagents are less reactive than organosodium, -potassium and -lithium compounds, that is the reason why it is more convenient to work with them.

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