Which will form hydrocarbon with Grignard reagent?

Options

A. `CH_(3)CHO`
B. `CH_(3)CH_(2)OH`
C. `CH_(3)COCH_(3)`
D. `CH_(3)COOCH_(3)`

Explanation

To determine which compound will form a hydrocarbon with a Grignard reagent, we need to analyze each option provided. A Grignard reagent is typically represented as R-MgX, where R is an organic group, and MgX is a magnesium halide. The R group acts as a nucleophile and can react with electrophiles to form hydrocarbons.

### Step-by-Step Solution:

1. **Understanding Grignard Reagents**:
- Grignard reagents are organomagnesium compounds that can react with various electrophiles to form new carbon-carbon bonds.
- The general formula is R-MgX, where R is an alkyl or aryl group, and X is a halogen.

2. **Analyzing Option A: CH3COH (Acetaldehyde)**:
- When CH3COH reacts with a Grignard reagent (e.g., CH3MgCl), it will form an alcohol (CH3C(OH)H2) rather than a hydrocarbon.
- **Conclusion**: This option does not form a hydrocarbon.

3. **Analyzing Option B: CH3CH2OH (Ethanol)**:
- Ethanol has an acidic hydrogen that can react with the Grignard reagent.
- When CH3CH2OH reacts with CH3MgCl, the Grignard reagent will deprotonate the alcohol, leading to the formation of CH3-CH2- (ethane) and Mg(OH)Cl.
- **Conclusion**: This option forms a hydrocarbon (ethane).

4. **Analyzing Option C: CH3COCH3 (Acetone)**:
- Acetone will react with a Grignard reagent, but it will lead to the formation of an alcohol (CH3C(OH)(CH3)2) rather than a hydrocarbon.
- **Conclusion**: This option does not form a hydrocarbon.

5. **Analyzing Option D: CH3COOCH3 (Methyl Acetate)**:
- Methyl acetate will also react with a Grignard reagent. The reaction will lead to the formation of an alcohol (CH3C(OH)(CH3)2) and a byproduct, but not a hydrocarbon.
- **Conclusion**: This option does not form a hydrocarbon.

### Final Answer:
The correct option that will form a hydrocarbon with a Grignard reagent is **Option B: CH3CH2OH (Ethanol)**.