Grignard reagent can be prepared by

Options

A. `CH_(3)-CH_(2)-CI +Mg overset("dry")underset("ether")rarr`
B. `CH_(3)-underset(CI)underset(|)(CH)-underset(OH)underset(|)(CH_(2)) +Mg overset("dry")underset("ether")rarr`
C. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-OH +Mg overset("dry")underset("ether")rarr`
D. All of them

Answer

To prepare a Grignard reagent, we need to react an alkyl halide with magnesium in the presence of dry ether. Here’s a step-by-step breakdown of the preparation process:

### Step 1: Identify the Components
- **Alkyl Halide**: This is the organic compound that contains a halogen atom (such as chlorine, bromine, or iodine) attached to an alkyl group.
- **Magnesium**: This is the metal that will react with the alkyl halide.
- **Dry Ether**: This is the solvent that provides an anhydrous environment necessary for the reaction to proceed.

### Step 2: Choose the Alkyl Halide
From the options given:
- Option A: Ethyl Chloride (C2H5Cl)
- Option B: 2-Chloropropane (C3H7Cl)
- Option C: Tert-Butyl Alcohol (not a halide)
- Option D: All of them

### Step 3: Analyze Each Option
- **Option A**: Ethyl Chloride with Magnesium in Presence of Dry Ether
- Reaction: C2H5Cl + Mg → C2H5MgCl (Ethyl Magnesium Chloride)

- **Option B**: 2-Chloropropane with Magnesium in Presence of Dry Ether
- Reaction: C3H7Cl + Mg → C3H7MgCl (Isopropyl Magnesium Chloride)

- **Option C**: Tert-Butyl Alcohol with Magnesium in Presence of Dry Ether
- This option is incorrect because tert-butyl alcohol does not contain a halide and cannot form a Grignard reagent.

### Step 4: Conclusion
Since both Option A and Option B can successfully produce Grignard reagents, but Option C cannot, the correct answer is:
- **Option D**: All of them is incorrect because it includes Option C.

### Final Answer
The Grignard reagent can be prepared by:
- **Option A**: Ethyl Chloride with Magnesium in Presence of Dry Ether
- **Option B**: 2-Chloropropane with Magnesium in Presence of Dry Ether