Question

In which of the following molecule dipole dipole interaction is absent:

• A. HCl
• B. Water
• C. carbon dioxide
• D. HF

Answer 1

The correct option is C carbon dioxide

Permanent dipole-dipole interaction is absent in carbon dioxide. The formula is $O=C=O$.

Oxygen is more electronegative in nature than Crabon. So, in this molecule, Oxygen attains partial negative charge. Whereas, Carbon attains partial positive charge. So carbon dioxide has polar bonds in it. But $C{O}_2$ is linear in shape. The polarity is same on both the sides of the carbon and hence the polarity gets cancelled because of the symmetry of the bonds or molecule. The net dipole moment of $C{O}_2$ is $0$. Thus, carbon dioxide lacks dipole-dipole interaction because of the symmetry of the molecule.