Chemical Bonding And Molecular Structure Question 538

Question: $ H_2O $ is dipolar, whereas $ BeF_2 $ is not. It is because [CBSE PMT 1989; 2004]

Options:

A) $ H_2O $ is linear and $ BeF_2 $ is angular

B) $ H_2O $ is angular and $ BeF_2 $ is linear

C) The electornegativity of F is greater than that of O

D) $ H_2O $ involves hydrogen bonding whereas $ BeF_2 $ is a discrete molecule

Show Answer

Answer:

Correct Answer: B

Solution:

The overall value of the dipole moment of a polar molecule depends on its geometry and shape i.e., vectorial addition of dipole moment of the constituent bonds water has angular structure with bond angle 105° as it has dipole moment. However $ BeF_2 $ is a linear molecule since dipole moment summation of all the bonds present in the molecule cancel each other.



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