The structure of 4-methyl pent-2-ene is

Options

A. `(CH_(3))_(2)CH-CH_(2)CH=CH_(2)`
B. `(CH_(3))_(2)CH-CH=CH-CH_(3)`
C. `(CH_(3))_(2)CH-CH_(2)CH=CH-CH_(3)`
D. `(CH_(3))_(2)C=CHCH_(2)CH_(3)`

Explanation

To determine the structure of 4-methylpent-2-ene, we will follow these steps:

### Step 1: Identify the Parent Chain
The name "pent" indicates that the parent chain consists of 5 carbon atoms. Therefore, we will start by drawing a straight chain of 5 carbon atoms.

**Hint:** The prefix "pent" in organic chemistry denotes a straight-chain hydrocarbon with 5 carbon atoms.

### Step 2: Determine the Position of the Double Bond
The "2-ene" part of the name indicates that there is a double bond starting at the second carbon. We will place a double bond between the second and third carbon atoms in our chain.

**Hint:** The number before "ene" tells you the position of the double bond in the carbon chain.

### Step 3: Add the Methyl Group
The "4-methyl" part of the name indicates that there is a methyl group (–CH₃) attached to the fourth carbon of the parent chain. We will add a methyl group to the fourth carbon atom.

**Hint:** The number before "methyl" indicates the carbon atom to which the methyl group is attached.

### Step 4: Complete the Valences with Hydrogen Atoms
Now that we have the carbon skeleton with the double bond and the methyl group, we need to complete the valences of all the carbon atoms with hydrogen atoms. Each carbon atom can form four bonds, so we will add enough hydrogen atoms to satisfy this requirement.

**Hint:** Each carbon atom must have four bonds; add hydrogen atoms as needed to achieve this.

### Step 5: Write the Final Structure
The final structure can be represented as follows:
- The carbon chain with the double bond and the methyl group can be written in condensed structural formula as:

CH₃-CH=CH-CH(CH₃)-CH₃

This can also be represented as:

CH₃-CH(CH₃)-CH=CH-CH₃

### Final Answer
The structure of 4-methylpent-2-ene is:

CH₃-CH=CH-CH(CH₃)-CH₃

### Summary of Steps:
1. Identify the parent chain (5 carbons).
2. Determine the position of the double bond (between C2 and C3).
3. Add the methyl group to the fourth carbon.
4. Complete the structure with hydrogen atoms.
5. Write the final condensed structural formula.