Chemical Bonding And Molecular Structure Question 299

Question: $ H_2O $ is dipolar, whereas $ BeF_2 $ is not. It I because

Options:

A) The electronegativity of F is greater than that of 0

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

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

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

Show Answer

Answer:

Correct Answer: D

Solution:

  • In a linear symmetrical molecule like $ [ BeF_2 ] $ the bond angle between three atoms is $ 180{}^\circ $ hence the polarity due to one bond is cancelled by the equal polarity due to other bond, while it is not so in the case of angular molecules like $ H_2O $ .


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