JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure Question Bank Dipole moment

  • question_answer Which bond angle \[\theta \]would result in the maximum dipole moment for the triatomic molecule \[YXY\] [AIIMS 1980]

    A)                 \[\theta ={{90}^{o}}\]   

    B)                 \[\theta ={{120}^{o}}\]

    C)                 \[\theta ={{150}^{o}}\] 

    D)                 \[\theta ={{180}^{o}}\]

    Correct Answer: A

    Solution :

               The dipole moment of two dipoles inclined at an angle \[\theta \] is given by the equation \[\mu =\sqrt{{{X}^{2}}+{{Y}^{2}}+2XY\cos \theta }\] \[\cos 90{}^\circ =0\]. 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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