Derived name of `CH_(2)=CH-CH_(2)CO-CH_(3)` is

Options

A. 1- Pentene-1-one
B. Allyl methyl ketone
C. 4-Pentene-2-one
D. Vinyl acetone

Answer

To derive the name of the compound `CH₂=CH-CH₂CO-CH₃`, we will follow these steps:

### Step 1: Identify the Structure
First, let's rewrite the structure of the compound clearly:
- The compound consists of a chain of five carbon atoms with a double bond and a ketone functional group.

### Step 2: Identify the Functional Group
The functional group in this compound is a ketone, which is characterized by the carbonyl group (C=O). In this case, the carbonyl group is located at the second carbon from the left in the chain.

### Step 3: Determine the Central Carbon Atom
The central carbon atom is the one that is part of the functional group and is attached to the maximum number of other carbon atoms. Here, the carbon atom of the carbonyl group is the central carbon.

### Step 4: Count the Carbon Atoms
Count the total number of carbon atoms in the longest continuous chain that includes the functional group:
- The longest chain has 5 carbon atoms.

### Step 5: Identify the Side Chains
Next, we need to identify any side chains. In this case:
- There is an allyl group (CH₂=CH-CH₂-) and a methyl group (CH₃-) attached to the central carbon.

### Step 6: Name the Side Chains
- The allyl group is named as "allyl" and the methyl group is named as "methyl".

### Step 7: Arrange the Groups Alphabetically
When naming the compound, we arrange the side chains alphabetically:
- "Allyl" comes before "methyl".

### Step 8: Combine the Names
Finally, we combine the names of the side chains with the functional group:
- The derived name of the compound is "Allyl methyl ketone".

### Final Answer
The derived name of `CH₂=CH-CH₂CO-CH₃` is **Allyl methyl ketone**.

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