NEET-XI-Chemistry
04: Chemical Bonding and Molecular Structure
- #22Explain why BeH2 molecule has a zero dipole moment although the Be-H bonds are polar.
Ans : The Lewis structure for BeH2 is as follows:
There is no lone pair at the central atom (Be) and there are two bond pairs. Hence, BeH2 is of the type AB2. It has a linear structure.
Dipole moments of each H-Be bond are equal and are in opposite directions. Therefore, they nullify each other. Hence, BeH2 molecule has zero dipole moment.