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A : Grignard's reagent is prepared in t...

A : Grignard's reagent is prepared in the presence of ether .
R : Grignard's reagent is soluble and stable in ether.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false , then mark (3)

D

If both Assertion and Reason are false statements , then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question regarding Grignard's reagent and its preparation in the presence of ether, we can break down the solution into clear steps: ### Step 1: Understand the Assertion The assertion states that "Grignard's reagent is prepared in the presence of ether." ### Step 2: Define Grignard's Reagent Grignard's reagent is represented as RMgX, where R is an alkyl or aryl group, Mg is magnesium, and X is a halogen. It is formed by the reaction of an alkyl halide (RX) with magnesium in an anhydrous ether solvent. ### Step 3: Understand the Reason The reason states that "Grignard's reagent is soluble and stable in ether." ### Step 4: Explain Solubility and Stability - **Solubility**: Grignard's reagent is highly polar due to the R-Mg bond, which allows it to dissolve well in polar solvents like ether. The principle of "like dissolves like" applies here, as both Grignard's reagent and ether are polar. - **Stability**: Ether is a chemically inert solvent, meaning it does not have acidic hydrogens that could react with the highly basic alkyl group (R-) of Grignard's reagent. This prevents unwanted reactions that would decompose the Grignard reagent. ### Step 5: Conclusion Both the assertion and the reason are true. The reason correctly explains why Grignard's reagent is prepared in the presence of ether. Therefore, the correct option is that both the assertion and reason are true, and the reason is a correct explanation of the assertion. ### Final Answer The correct answer is: Both assertion and reason are true, and the reason is a correct explanation of the assertion. ---
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Knowledge Check

  • Grignard reagents produce carbonyl compounds with

    A
    `CO_(2)`
    B
    `R-C-=N`
    C
    `R-overset(O)overset(||)(C)-Cl`
    D
    `R-overset(O)overset(||)(C)-O-R'`

  • Which of the following Grignard reagent can be prepared ?

    A
    `Br-Mg-CH_(2)-CH_(2)-CH_(2)-O-H`
    B
    `Br-Mg-CH_(2)-CH_(2)-SH`
    C
    `BrMg-CH_(2)-CH_(2)-NH_(2)`
    D
    `BrMg-CH_(2)-CH_(2)-underset(CH_(3))underset(|)(N)-CH_(3)`

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