The dipole moment of chlorobenzene is 1.73 D . The dipole moment of p-dichlorobenzene is expected to be

Options

A. 3.46 D
B. 0.00D
C. 1.73 D
D. 1.00 D

Explanation

To determine the dipole moment of p-dichlorobenzene based on the given dipole moment of chlorobenzene, we can follow these steps:

### Step 1: Understand the structure of chlorobenzene
Chlorobenzene (C6H5Cl) has a chlorine atom attached to a benzene ring. The dipole moment of chlorobenzene is due to the electronegativity difference between carbon and chlorine, which creates a polar bond.

**Hint:** Remember that dipole moments are vector quantities and depend on both the magnitude and direction of the dipoles.

### Step 2: Analyze the structure of p-dichlorobenzene
p-Dichlorobenzene (C6H4Cl2) has two chlorine atoms attached to the benzene ring at the para position (opposite sides). The dipole moments of the two C-Cl bonds will have the same magnitude but will be oriented in opposite directions.

**Hint:** Consider how the orientation of the dipoles affects the resultant dipole moment.

### Step 3: Calculate the resultant dipole moment
Since the dipole moments of the two C-Cl bonds in p-dichlorobenzene are equal in magnitude (1.73 D) and opposite in direction, they will cancel each other out. Therefore, the resultant dipole moment of p-dichlorobenzene will be zero.

**Hint:** When two dipoles are equal in magnitude and opposite in direction, they cancel each other out.

### Final Answer
The expected dipole moment of p-dichlorobenzene is **0 D**.