Give the IUPAC name of : `p-ClC_6H_4CH_2CH(CH_3)_2`

Options

A. 3-methyl-1-(4-chlorobenzyl) propane
B. 2-methyl-1-(4-chlorobenzyl) propane
C. 2-methyl-1-(4-chlorophenyl) propane
D. 1-chloro-4-(2-methylpropyl) benzene

Explanation

To determine the IUPAC name of the compound `p-ClC_6H_4CH_2CH(CH_3)_2`, we can follow these steps:

### Step 1: Identify the Structure
The compound consists of a benzene ring with a chlorine atom and a propyl group. The "p" in `p-Cl` indicates that the chlorine is in the para position relative to the substituent on the benzene ring.

### Step 2: Draw the Structure
1. Draw a benzene ring (C6H4).
2. Place a chlorine (Cl) atom on one carbon of the benzene ring (let's say carbon 1).
3. Place a CH2 group (methylene) on the carbon directly opposite to the chlorine (carbon 4).
4. The CH2 group is connected to a carbon (C) that has two methyl (CH3) groups attached to it, indicating a branched propyl group.

### Step 3: Number the Carbon Atoms
1. Start numbering the benzene ring from the carbon where the chlorine is attached (1).
2. The carbon with the CH2 group will be carbon 4.
3. The carbon connected to the CH2 group that has two methyl groups will be carbon 1 of the propyl chain.

### Step 4: Identify the Alkyl Group
The carbon connected to the CH2 has two methyl groups attached to it, making it a 2-methylpropyl group.

### Step 5: Combine the Names
1. The chlorine is at position 1, and the propyl group is at position 4.
2. The propyl group has a methyl branching at position 2.
3. Therefore, the IUPAC name will be: **1-chloro-4-(2-methylpropyl)benzene**.

### Final Answer
The IUPAC name of the compound `p-ClC_6H_4CH_2CH(CH_3)_2` is **1-chloro-4-(2-methylpropyl)benzene**.

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