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Question:

H2O is polar, whereas BeF2 is not because:

H2O involves H-bonding ,whereas BeF2 is a discrete molecule

electronegativity of F is greater than that of O

H2O is angular and BeF2 is linear

H2O is linear and BeF2 is angular.

Solution:

Because of linear shape, dipole moments cancel each other in BeF2 (F→Be←F) and thus, it is non-polar , whereas H2O is V-shaped and hence, it is polar.