Identify the reactant X and the product Y
`CH_(3) - CO - CH_(3) + X rarr (CH_(3))_(3) C - OMg - Cl rarr Hydrolysis`
`Y + Mg (OH) CI`

Options

A. `X = MgCl_(2) , Y = CH_(3) -CH=CH_(2)`
B. `X= CH_(3)MgCl, Y = C_(2)H_(5)COCH_(3)`
C. `X=CH_(3)MgCl,Y= (CH_(3))_(3)C-OH`
D. `X=C_(2)H_(5)MgCl, Y = (CH_(3))_(3)C-OH`

Answer

To solve the problem, we need to identify the reactant X and the product Y in the given reaction sequence. The reaction involves acetone (CH₃COCH₃) reacting with a reactant X to form an intermediate, which upon hydrolysis yields product Y and Mg(OH)Cl.

### Step-by-Step Solution:

1. **Identify the Reactant**:
- The starting compound is acetone (CH₃COCH₃).
- The reactant X is a Grignard reagent. Grignard reagents are typically of the form R-Mg-X, where R is an alkyl or aryl group and X is a halogen.
- In this case, we need a Grignard reagent that can react with the carbonyl group of acetone. The most suitable Grignard reagent is methyl magnesium chloride (CH₃MgCl).

2. **Reaction with Grignard Reagent**:
- When acetone reacts with methyl magnesium chloride, the nucleophilic methyl group (CH₃⁻) attacks the electrophilic carbon of the carbonyl group (C=O) in acetone.
- This results in the formation of a tetrahedral intermediate where the oxygen becomes negatively charged.

3. **Formation of the Intermediate**:
- The negatively charged oxygen then coordinates with the magnesium ion (Mg²⁺) from the Grignard reagent, forming a complex.
- The structure of the intermediate can be represented as CH₃C(OH)(CH₃)MgCl, which is a magnesium alkoxide.

4. **Hydrolysis**:
- Upon hydrolysis, the intermediate reacts with water (or another source of protons) to replace the MgCl group with a hydrogen atom.
- This results in the formation of a tertiary alcohol.

5. **Identify the Product Y**:
- The product formed after hydrolysis is 2-methyl-2-propanol (also known as tert-butanol), which can be represented as (CH₃)₃COH.
- Therefore, the product Y is 2-methyl-2-propanol.

### Final Identification:
- **Reactant X**: Methyl magnesium chloride (CH₃MgCl)
- **Product Y**: 2-methyl-2-propanol ((CH₃)₃COH)

### Summary:
- The reactant X is CH₃MgCl (methyl magnesium chloride).
- The product Y is (CH₃)₃COH (2-methyl-2-propanol).