The correct way (s) of representing 2 – bromobutane is /are

Options

A. `CH_3CHBrCH_2CH_3`
B.
C.
D. None of the above

Answer

To represent 2-bromobutane correctly, we need to follow these steps:

### Step 1: Understand the Structure of Butane
Butane is a straight-chain alkane with four carbon atoms. Its molecular formula is C4H10. The structure can be represented as:
- CH3-CH2-CH2-CH3

### Step 2: Identify the Position of the Bromine Atom
In 2-bromobutane, the bromine (Br) atom is attached to the second carbon atom of the butane chain. This means we need to number the carbon chain from one end to the other, ensuring that the bromine is on the second carbon.

### Step 3: Draw the Structure of 2-bromobutane
The structure can be represented as follows:
- CH3-CH(Br)-CH2-CH3

This indicates that the bromine is attached to the second carbon atom.

### Step 4: Consider Different Representations
We can represent 2-bromobutane in different ways:
1. **Structural Formula**: CH3-CH(Br)-CH2-CH3
2. **Condensed Structural Formula**: C4H9Br
3. **Line-Angle Formula**: A zigzag line representing the carbon backbone with a Br attached to the second carbon.

### Step 5: Verify the Options
From the video transcript, it is mentioned that options 1, 2, and 3 are correct representations of 2-bromobutane, while option 4 is incorrect. This means that all three representations correctly depict the bromine atom on the second carbon.

### Final Answer
The correct ways of representing 2-bromobutane are options 1, 2, and 3.

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