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JIPMER 2009
Exam
JIPMER
Year
2009
Subject
Chemistry
Chapter
Alcohols Phenols and Ethers

JIPMER 2009 · Chemistry · Alcohols Phenols and Ethers

Which of the following can give a Grignard reagent when reacted...

Which of the following can give a Grignard reagent when reacted with magnesium in dry ether ?

Options

  1. AC2H6\mathrm{C}_2 \mathrm{H}_6
  2. BC2H5Cl\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}
  3. CC2H5OH\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}
  4. DC2H5CN\mathrm{C}_2 \mathrm{H}_5 \mathrm{CN}

Correct answer

B. C2H5Cl\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}

Step-by-step solution

\mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl} can give Grignard reagent when reactedwithMgindryether.with Mg in dry ether.RX+Mg (dry) → Dry ether RMgXC2H5Cl+Mg→ Dry ether +C2H5MgClethyl magnesium chloride\begin{aligned} & R X+\mathrm{Mg} \text{ (dry) } \xrightarrow{\text{ Dry ether }} R \mathrm{MgX} \\ & \mathrm{C}_2 \mathrm{H}_5 \mathrm{Cl}+\mathrm{Mg} \xrightarrow{\text{ Dry ether }}+\underset{\text{ethyl magnesium chloride}}{\mathrm{C}_2 \mathrm{H}_5 \mathrm{MgCl}}\end{aligned}$$
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