The IUPAC name of the compounds `CH_(3)CH(OH)CH_(2)CH(CH_(3))CHO` is `:`

Options

A. 2-hydroxy-4-methyl pentanal
B. 3-hydroxy-2-methyl butanal
C. 4-hydroxy-2-methyl pentanal
D. 3-hydroxy-2-methyl pentanal

Explanation

To determine the IUPAC name of the compound `CH₃CH(OH)CH₂CH(CH₃)CHO`, we will follow the systematic approach of naming organic compounds. Here’s a step-by-step solution:

### Step 1: Identify the Longest Carbon Chain
The first step in IUPAC nomenclature is to identify the longest continuous carbon chain that includes the functional group.

For the compound `CH₃CH(OH)CH₂CH(CH₃)CHO`, the longest chain consists of 5 carbon atoms:
- CH₃-CH-CH₂-CH-CHO

### Step 2: Identify Functional Groups
Next, we identify the functional groups present in the compound:
- The aldehyde group (CHO) is the primary functional group.
- The hydroxyl group (OH) is a secondary functional group.

### Step 3: Number the Carbon Chain
We need to number the carbon chain in such a way that the primary functional group (aldehyde) gets the lowest possible number. The aldehyde group is given the number 1.

Thus, the numbering from the aldehyde end is:
1. CHO (1)
2. CH₂ (2)
3. CH (3)
4. CH(OH) (4)
5. CH₃ (5)

### Step 4: Identify and Name Substituents
Now we identify the substituents:
- There is a hydroxyl group (-OH) on carbon 4, which is named as "hydroxy".
- There is a methyl group (-CH₃) on carbon 2.

### Step 5: Assemble the Name
According to IUPAC nomenclature rules:
1. List the substituents in alphabetical order.
2. Use the appropriate prefixes for the number of carbons in the main chain.
3. Add the suffix for the primary functional group.

Putting this all together:
- The substituents are: 4-hydroxy and 2-methyl.
- The root name for the longest chain of 5 carbons is "pent".
- The suffix for the aldehyde group is "al".

Thus, the complete IUPAC name is:
**4-hydroxy-2-methylpentanal**

### Final Answer
The IUPAC name of the compound `CH₃CH(OH)CH₂CH(CH₃)CHO` is **4-hydroxy-2-methylpentanal**.

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