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Answer :
Final answer:
Ethereal solvents like diethyl ether or THF are optimal for Grignard reactions because they serve as non-acidic media that dissolve reagents well and stabilize the Grignard reagent through coordination as Lewis bases, not as Lewis acids.
Explanation:
Ethereal solvents are optimal for use in Grignard reactions for all of the following reasons EXCEPT D. The ether oxygen acts as a Lewis acid to coordinate with the magnesium of the Grignard reagent, improving its solubility in the ether solvent. In reality, the ether oxygen acts as a Lewis base, not a Lewis acid, as it donates a pair of electrons to form a coordination complex with magnesium. This complexation with the magnesium atom in Grignard reagents enhances their stability and solubility in ethereal solvents like diethyl ether or THF (tetrahydrofuran). Ethereal solvents are preferred in Grignard reactions because they are not acidic, effectively dissolve the reagents, and their oxygen atoms can serve as Lewis bases to coordinate with magnesium, thus stabilizing the Grignard reagent.
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The coordinated Grignard reagents display good solubility in ethereal solvents. Therefore, the correct option is option A.
What is Ether?
Ethers are a subclass of compounds in organic chemistry that have an ether group, which is an oxygen atom joined to two aryl or alkyl groups. The typical formula for them is ROR′, where R as well as R′ stand for the aryl and alkyl groups.
Ethers can be further divided into two types if the alkyl as well as aryl groups on either side of both the oxygen atom are identical. Ethereal solvents are optimal for use in Grignard reactions for all of the following reasons except the coordinated Grignard reagents display good solubility in ethereal solvents.
Therefore, the correct option is option A.
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