Which of the following molecules has the maximum dipole moment? [2014]

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Solution

Q.
Which of the following molecules has the maximum dipole moment [2014]

1 ${CO}_{2}$

2 ${CH}_{4}$

3 ${NH}_{3}$

4 ${NF}_{3}$

Ans.
(3)

In ${NH}_{3}$ , H is less electronegative than N and hence dipole moment of each N—H bond is towards N resulting in high net dipole moment whereas in ${NF}_{3}$ , F is more electronegative than N, the dipole moment of each N—F bond is opposite to that of lone pair, hence reducing the net dipole moment.

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