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Question

In water molecule, the two O−H bonds are oriented at an angle of 104.5o. In BF3, the three B−F bonds are oriented at an angle of 120o. In BeF2, the two Be−F bonds are oriented at an angle of 180o. Which of the following will have highest dipole moment?

A
BeF2
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B
BF3
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C
H2O
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D
All have zero dipole moment.
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Solution

The correct option is D H2O
BF3 and BeF2 both have the symmetric structures, trigonal planner and linear respectively.
that's why BF3 and BeF2 have zero dipole moment.
H2O has V shape that is the unsymmetrical structure that's why $H_2O has the maximum dipole moment.
So the correct option is C.

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