The structure of 3 - methyl butan - 2 - ol is:

Options

A. `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)-CH_(3)`
B. `CH_(3)-overset(OH)overset(|)(CH)-overset(CH_(3))overset(|)(CH)-CH_(3)`
C. `CH_(3)-undersetunderset(CH_(3))(|)oversetoverset(OH)(|)(C)-CH_(2)-CH_(3)`
D. None of these

Answer

To determine the structure of 3-methylbutan-2-ol, we can follow these steps:

### Step 1: Identify the Parent Chain
The name "butan" indicates that the parent chain consists of 4 carbon atoms.

**Hint:** The prefix "but-" refers to a four-carbon chain.

### Step 2: Number the Carbon Atoms
Number the carbon atoms in the chain from one end to the other. The numbering should start from the end closest to the functional group (the -OH group in this case).

**Hint:** Always number the chain to give the functional group the lowest possible number.

### Step 3: Identify the Functional Group
The "2-ol" indicates that there is an -OH (hydroxyl) group on the second carbon of the chain.

**Hint:** The suffix "-ol" indicates the presence of an alcohol functional group.

### Step 4: Identify the Methyl Group
The "3-methyl" indicates that there is a methyl (-CH3) group attached to the third carbon of the main chain.

**Hint:** The prefix "methyl" refers to a one-carbon substituent.

### Step 5: Draw the Structure
Now, we can draw the structure based on the information gathered:
- The main chain (butane) has 4 carbon atoms: C1, C2, C3, C4.
- The -OH group is on C2.
- The -CH3 group is on C3.

The structure can be represented as follows:

```
CH3
|
CH3-CH-CH2-CH3
|
OH
```

### Final Structure
The final structure of 3-methylbutan-2-ol can be written as:
```
CH3
|
CH3-CH-CH2-CH3
|
OH
```

### Summary
The structure of 3-methylbutan-2-ol consists of a four-carbon chain with an -OH group on the second carbon and a methyl group on the third carbon.

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