Question

Select the 'WRONG' statement about polar molecules.

• A. A molecule in which centre of mass of positive charges does not coincide with the centre of mass of negative charges is a polar molecule.
• B. They have permanent dipole moment.
• C. They act as tiny electric dipoles.
• D. They have symmetrical shape.

Hint:

A polar molecule has a lopsided charge distribution, so its shape is not symmetrical.

Answer 1

The Correct Option is D

Step 1: Approach
Sort the statements into definition, property and shape.

Step 2: Sorting
Definition: centres of positive and negative charge differ. Property: permanent dipole moment, acts as a small dipole. Shape: if the shape were perfectly symmetrical, the charge centres would coincide and the dipole moment would be zero.

Step 3: Conclusion
The statement about symmetrical shape does not describe polar molecules, option (D).

Final Answer:
Polar molecules have an unsymmetrical charge arrangement, so the symmetrical-shape statement is wrong, option (D). \[ \boxed{\text{(D)}} \]