MCQ
Which bond angle $\theta $ would result in the maximum dipole moment for triatomic molecule $XY_2$ shown below
- ✓$\theta = 90^o$
- B$\theta = 120^o$
- C$\theta = 150^o$
- D$\theta = 180^o$
✓
Answer
Correct option: A.
$\theta = 90^o$
a
The dipole moment of two dipole inclined at an angle $\theta$ is given by the equation $\mu=\sqrt{ X ^2+ Y ^2+2 XY \cos \theta}$ the value of $\cos 90^{\circ}=0$
The dipole moment of two dipole inclined at an angle $\theta$ is given by the equation $\mu=\sqrt{ X ^2+ Y ^2+2 XY \cos \theta}$ the value of $\cos 90^{\circ}=0$
Since the angle increases from $90-180,$ the value of $\cos \theta$ becomes more and more -ve and hence resultant decreases, thus dipole moment is maximum when $\theta=90^{\circ}$.
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