Question

The molecule having a non-zero dipole moment is :

• A. $H_2{O}_2$
• B. $C{H}_4$
• C. $C_2{H}_6$
• D. $B{F}_4^{-}$

Answer 1

The correct option is A $H_2{O}_2$

The structure of $H_2{O}_2$ is like an open book (see the structure given). So, its dipole moment is non-zero.

$C{H}_4$ and $B{F}_4^{-}$ occupy regular tetrahedron structures. In these molecules, vector sum of the dipole moment of the first three bonds will be cancelled by the dipole moment of $4^{th}$ bond.

In $C_2{H}_6$, the dipole moment of the $1^{st}$ carbon atom is cancelled by the dipole moment of the $2^{nd}$ carbon atom.