1
Question
Which of the following statements is/are correct?
Which of the following statements is/are correct?
Dipole moment of:
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Solution
The correct options are
C Dipole moment of : NH3>NF3.
D Dipole moment of: CH3Cl>CH2Cl2>CHCl3>CCl4.
a. In (I), intramolecular H-bonding decreases the bond angle (<60o), hence, dipole moment (μ) has highest value. III has more dipole moment than II because of higher electronegativity of Cl as compared to methyl group Thus, the correct order of dipole moment is
(I) > (III) > (II)
b. CH3Cl has larger dipole moment than CH3F because dipole moment is based on the product of distance and charge, and not just charge alone. Fluorine is more electronegative than chlorine, but, the C−F bond is also much shorter than the C−Cl bond. Thus charge seperation is larger in CH3Cl as compared to CH3F So, dipole moment follows the order :
CH3Cl>CH3F.
c. The dipole moment of ammonia is greater than the dipole moment of nitrogen trifluoride. In case of ammonia, the bond dipoles and the dipole moment of the lone pair reinforce each other.
In case of nitrogen trifluoride, they oppose each other.
d. The individual bond dipoles of C - H and C - Cl bond are in opposite directions. Thus increase in number C-Cl bonds, dipole moment will oppose each other and cancels out.
The correct order of the dipole moments is CH3Cl>CH2Cl2>CHCl3>CCl4
C Dipole moment of : NH3>NF3.
D Dipole moment of: CH3Cl>CH2Cl2>CHCl3>CCl4.
a. In (I), intramolecular H-bonding decreases the bond angle (<60o), hence, dipole moment (μ) has highest value. III has more dipole moment than II because of higher electronegativity of Cl as compared to methyl group Thus, the correct order of dipole moment is
(I) > (III) > (II)
b. CH3Cl has larger dipole moment than CH3F because dipole moment is based on the product of distance and charge, and not just charge alone. Fluorine is more electronegative than chlorine, but, the C−F bond is also much shorter than the C−Cl bond. Thus charge seperation is larger in CH3Cl as compared to CH3F So, dipole moment follows the order :
CH3Cl>CH3F.
c. The dipole moment of ammonia is greater than the dipole moment of nitrogen trifluoride. In case of ammonia, the bond dipoles and the dipole moment of the lone pair reinforce each other.
In case of nitrogen trifluoride, they oppose each other.
d. The individual bond dipoles of C - H and C - Cl bond are in opposite directions. Thus increase in number C-Cl bonds, dipole moment will oppose each other and cancels out.
The correct order of the dipole moments is CH3Cl>CH2Cl2>CHCl3>CCl4
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