Draw the Structure of butane Which is 4th member of alkane family

Explanation

To draw the structure of butane, the 4th member of the alkane family, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the General Formula for Alkanes:**
- The general formula for alkanes is given by \( C_nH_{2n+2} \).
- For butane, which is the 4th member of the alkane family, we set \( n = 4 \).

2. **Calculate the Number of Carbons and Hydrogens:**
- Using the formula, we substitute \( n \):
\[ C_4H_{2(4)+2} = C_4H_{10} \]
- This means butane has 4 carbon atoms and 10 hydrogen atoms.

3. **Draw the Carbon Backbone:**
- Start by drawing a straight chain of 4 carbon atoms. Each carbon atom will be connected by a single bond.
- The structure will look like this:
\[ C - C - C - C \]

4. **Add Hydrogen Atoms:**
- Each carbon atom can form 4 bonds. To satisfy the tetravalency of carbon, we need to add hydrogen atoms.
- The first and last carbon atoms (terminal carbons) will each be bonded to 3 hydrogen atoms, while the two middle carbon atoms will each be bonded to 2 hydrogen atoms.
- The complete structure will look like this:
\[ H_3C - CH_2 - CH_2 - CH_3 \]

5. **Final Structure of Butane:**
- The final structural representation of butane can be depicted as:
```
H H H
| | |
H-C - C - C - H
| | |
H H H
```
- This shows that butane (C4H10) consists of a straight chain of 4 carbon atoms with the appropriate number of hydrogen atoms attached.