NEETChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
H2O is dipolar, whereas BeF2 is not. It is because
- Athe electronegativity of F is greater than that of O
- BH2O involves hydrogen bonding whereas BeF2 is a discrete molecule
- CH2O is linear and BeF2 is angular
- DH2O is angular and BeF2 is linear.
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Correct answer: D
In H2O the central atom oxygen has two lone pairs of electrons and two bond pairs of electrons. Thus, the shape of H2O is bent or V-shape. Thus, the two dipoles of H-O bonds have some resultant value as they are not exactly in the opposite direction to cancel out each other. While in BeF2, there are two bond pairs on central atom Be, hence it is linear in shape. Thus, the two dipoles of bonds are exactly in opposite direction to each other and cancel each other to give net zero dipole moment.
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