AIIMS2017Chemistry-Organometallic Compounds

AIIMS 2017 Chemistry Grignard Reagents MCQ Question

Type: MCQ-conceptual-Medium-Class 12

An allylide on hydrolysis gives allylene. The alkaline earth metal cation of the allylide dissolves in dry ether in the presence of an alkyl halide to form a Grignard reagent. The allylide is

A

Mg2C2\text{Mg}_2\text{C}_2

B

Ca2C3\text{Ca}_2\text{C}_3

C

MnC2\text{MnC}_2

D

MgB2\text{MgB}_2

Correct Answer

Option C

Detailed Explanation

In the reaction involving magnesium (Mg) and acetylene (C₂H₂) to form the allylide Mg₂C₂, the presence of dry ether facilitates the formation of a Grignard reagent (R – MgX), where R represents the alkyl or aryl group derived from the acetylene. This reaction is significant as Grignard reagents are crucial for carbon-carbon bond formation in organic synthesis. Other options are not applicable as they do not pertain to the formation of Grignard reagents or the specific reaction conditions mentioned. Understanding the role of dry ether in stabilizing the Grignard reagent is essential for grasping its reactivity in subsequent organic transformations.

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