The structure of cis-3-hexene is

Options

A.
B.
C.
D.

Explanation

To determine the structure of cis-3-hexene, we will follow these steps:

### Step 1: Understand the molecular formula
Cis-3-hexene is an alkene with the formula C6H12. The "3" indicates that the double bond is located between the 3rd and 4th carbon atoms in the chain.

**Hint:** Remember that alkenes have at least one carbon-carbon double bond, and the numbering indicates the position of that double bond.

### Step 2: Draw the carbon chain
Start by drawing a straight chain of 6 carbon atoms. This can be represented as:

```
C1 - C2 - C3 - C4 - C5 - C6
```

**Hint:** Count the carbon atoms carefully to ensure you have a total of 6.

### Step 3: Add the double bond
Place a double bond between the 3rd and 4th carbon atoms. This gives us:

```
C1 - C2 - C3 = C4 - C5 - C6
```

**Hint:** The double bond is represented by an "=" sign between the two carbon atoms.

### Step 4: Add hydrogen atoms
Now, we need to add hydrogen atoms to satisfy the tetravalency of carbon. Each carbon should make four bonds. The structure will look like this:

```
CH3 - CH2 - CH = CH - CH2 - CH3
```

**Hint:** Remember that each carbon atom can bond with up to four other atoms (either carbon or hydrogen).

### Step 5: Identify the cis configuration
In cis-3-hexene, the two bulky groups (in this case, the ethyl groups) must be on the same side of the double bond. The structure can be represented as:

```
H H
\ /
C = C
/ \
CH2 CH2
|
CH3
```

This indicates that the two groups attached to the double bond (the ethyl groups) are on the same side.

**Hint:** In cis isomers, similar or larger substituents are on the same side of the double bond.

### Final Structure
Thus, the final structure of cis-3-hexene is:

```
CH3
|
CH2 - C = C - CH2 - CH3
|
H
```

### Summary
The structure of cis-3-hexene has the double bond between the 3rd and 4th carbon atoms, with the larger substituents on the same side.