The bezylic carbon in `C_6H_5-CH_2-CH_2-COOH` is

Options

A. linearly placed with respect to benzene ring and carbonyl group
B. trigonaly shaped
C. tetrahedral in shape
D. at `90^@` to the plane of benzene bing

Answer

To determine the benzylic carbon in the compound \( C_6H_5-CH_2-CH_2-COOH \), we will follow these steps:

### Step 1: Identify the Structure of the Compound
The molecular formula \( C_6H_5-CH_2-CH_2-COOH \) indicates that we have a phenyl group (C6H5) attached to a carbon chain that leads to a carboxylic acid (COOH). The structure can be drawn as follows:

- The phenyl group (C6H5) is a benzene ring.
- The next carbon (CH2) is attached directly to the phenyl group.
- Following that, there is another CH2 group.
- Finally, there is a carboxylic acid group (COOH) attached to the last carbon.

### Step 2: Identify the Benzylic Carbon
A benzylic carbon is defined as the carbon atom that is directly attached to a benzene ring. In our structure, the carbon that is directly connected to the phenyl group (C6H5) is the first CH2 group.

### Step 3: Confirm the Benzylic Carbon
In the structure:
- The first CH2 is benzylic because it is adjacent to the benzene ring.
- The second CH2 and the carbon in the carboxylic acid (COOH) are not benzylic as they are not directly attached to the benzene ring.

### Conclusion
Thus, the benzylic carbon in \( C_6H_5-CH_2-CH_2-COOH \) is the first CH2 group that is directly bonded to the phenyl ring.

### Final Answer
The benzylic carbon in \( C_6H_5-CH_2-CH_2-COOH \) is the carbon in the \( CH_2 \) group that is directly attached to the phenyl ring.

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