2-methyl propan-1-ol is obtained from

Options

A. Phenol + conc.` H_2SO_4`
B. Phenol + conc. `HNO_3`
C. ethanal+ `(CH_3)+2CHMgX`
D. methanal + `(CH_3)_2CHMgX`

Explanation

To obtain 2-methylpropan-1-ol, we can analyze the options provided and determine which reaction leads to the desired product. Here’s a step-by-step solution:

### Step 1: Understand the Structure of 2-Methylpropan-1-ol
2-methylpropan-1-ol is an alcohol with the following structure:
- The main carbon chain is propane (3 carbon atoms).
- There is a methyl group (–CH3) attached to the second carbon.
- The hydroxyl group (–OH) is attached to the first carbon.

### Step 2: Analyze the Given Options
We have four options to consider for the synthesis of 2-methylpropan-1-ol. We will evaluate each option to see if it can yield the desired product.

### Step 3: Evaluate Option A
**Phenol + Concentrated H2SO4**
- This reaction leads to the formation of sulfonic acid derivatives and does not yield 2-methylpropan-1-ol.
- **Conclusion**: This option is incorrect.

### Step 4: Evaluate Option B
**Phenol + Concentrated H2SO4 (with NO3)**
- This reaction results in the formation of nitrophenols (e.g., picric acid) and does not produce 2-methylpropan-1-ol.
- **Conclusion**: This option is incorrect.

### Step 5: Evaluate Option C
**Ethanol + CH3MgX (Grignard Reagent)**
- When ethanol reacts with a Grignard reagent, it typically leads to the formation of a secondary alcohol (propane-2-ol) rather than the desired product.
- **Conclusion**: This option is incorrect.

### Step 6: Evaluate Option D
**Methanol + (CH3)2CHMgX (Grignard Reagent)**
- In this reaction, methanol reacts with a Grignard reagent that has two methyl groups. This leads to the formation of 2-methylpropan-1-ol.
- The Grignard reagent adds to the carbonyl carbon, and upon hydrolysis, we obtain the desired alcohol.
- **Conclusion**: This option is correct.

### Final Answer
2-methylpropan-1-ol can be obtained from **methanol and (CH3)2CHMgX (Grignard reagent)**.