First slide
Polarity of the bond and Dipolemoment
Question

Which bond angle θ would result in the maximum dipole moment for the triatomic molecule YXY ?

Moderate
Solution

The dipole moment of two dipoles inclined at an angle θ is given by the equation 

μ=X2+Y2+2XYcosθ

cos900=0. Since the angle increases from 90 to 180, the value of cosθ becomes more and more - ve and hence resultant decreases. Thus, dipole moment is maximum when

θ=900.

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