Write the structure of the following:
Ethyl-sec.butyl ketone

Explanation

To write the structure of Ethyl-sec-butyl ketone, we will follow these steps:

### Step 1: Understand the components of the name
- **Ethyl**: This indicates a two-carbon alkyl group (C2H5 or CH3CH2).
- **Sec-butyl**: This refers to a secondary butyl group, which has four carbon atoms (C4H9) where one of the carbon atoms is attached to the ketone carbon. The structure of the secondary butyl group is such that it has a branching, specifically at the second carbon.

### Step 2: Identify the ketone functional group
- A ketone has the functional group C=O (carbonyl group), where the carbon atom of the carbonyl is bonded to two other carbon atoms (alkyl groups).
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