IUPAC name of `HO-CH_2-CHOH-CH_2OH` is ___________

Options

A. Glycerol
B. Glycerine
C. Propan-1,2,3-triol
D. Propan-3-ol

Answer

To determine the IUPAC name of the compound `HO-CH2-CHOH-CH2OH`, we will follow these steps:

### Step 1: Identify the longest carbon chain
The given compound can be represented as:
```
HO-CH2-CHOH-CH2OH
```
Here, we can see that there are three carbon atoms in a straight chain. Therefore, the longest carbon chain has 3 carbon atoms.

### Step 2: Determine the base name
According to IUPAC nomenclature, the base name for a three-carbon alkane is "propane". Since we have alcohol groups (-OH) present, we will use "prop" as the base name.

### Step 3: Identify the functional groups
The compound contains three hydroxyl (-OH) groups. Each -OH group indicates that the compound is an alcohol.

### Step 4: Number the carbon chain
We will number the carbon chain starting from the end closest to the first -OH group to give the lowest possible numbers to the functional groups. The numbering will be as follows:
1. C1: -OH (first carbon)
2. C2: -OH (second carbon)
3. C3: -OH (third carbon)

### Step 5: Assign positions of the -OH groups
Since there are three -OH groups, they are located at positions 1, 2, and 3.

### Step 6: Combine the information
The IUPAC name will include the base name "prop" and the number of hydroxyl groups. Since there are three -OH groups, we will use the prefix "triol" to indicate three alcohol functional groups.

### Final IUPAC Name
Putting it all together, the IUPAC name of the compound `HO-CH2-CHOH-CH2OH` is **propane-1,2,3-triol**.

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