The IUPAC name of `CH_(3)C-=C CH(CH_(3))_(2)` is

Options

A. 4-Methylpent-2-yne
B. 4,4-Dimethylbut-2-yne
C. Methyl isopropyl acetylene
D. 2-Methylpent-4-yne

Explanation

To determine the IUPAC name of the compound `CH₃C≡CCH(CH₃)₂`, we will follow these steps:

### Step 1: Identify the Structure
The given compound can be represented structurally as:
```
CH₃
|
CH₃-C≡C-CH
|
CH₃
```
This shows a carbon chain with a triple bond and a branching methyl group.

### Step 2: Number the Carbon Chain
We need to number the carbon chain in such a way that the triple bond gets the lowest possible number. The longest continuous carbon chain has 5 carbons.

- If we number from left to right:
- C1: CH₃
- C2: C (part of the triple bond)
- C3: C (part of the triple bond)
- C4: CH
- C5: CH₃ (branching)

This gives the triple bond the number 2.

### Step 3: Identify the Functional Group
Since we have a triple bond, the compound is classified as an alkyne. The suffix for an alkyne is "-yne".

### Step 4: Identify the Substituents
There is a methyl group (CH₃) attached to the fourth carbon (C4).

### Step 5: Combine the Information
- The longest carbon chain is 5 carbons (pentane).
- The triple bond is located at carbon 2 (indicated as "2").
- There is a methyl group at carbon 4.

### Step 6: Write the IUPAC Name
Putting all the information together, we have:
- The name will be 4-methyl (for the methyl group at C4)
- The base name will be pent (for the 5-carbon chain)
- The position of the triple bond will be indicated as 2 (for the triple bond at C2)
- The suffix for the triple bond is "-yne".

Thus, the complete IUPAC name is **4-methyl-2-pentyne**.

### Final Answer
**The IUPAC name of `CH₃C≡CCH(CH₃)₂` is 4-methyl-2-pentyne.**

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