Question

In the following which one will have zero dipole moment ?

• A. ${BF}_3$
• B. ${CCl}_4$
• C. ${BeCl}_2$
• D. All of these

Answer 1

Answer: (D)

All of these

he 4 C-Cl bonds in CCl4CCl4 are oriented to point at the vertices of a regular tetrahedron, and they cancel each other out exactly, so CCl4CCl4 has no dipole moment

In case of BF3BF3 the dipole moment is zero because it has a regular geometry and no lone pair of electrons is present on BB. All the angles are 120 degree.

The overall dipole of a molecule also depends on the geometry. The geometry of $BC{l}_3$ is planar with a bond angle of 120 degree. The resultant dipole of two $B-Cl$ bonds cancels the third one, resulting in net zero dipole.

Therefore the correct answer is option D.