Statement - I: Since Fluorine is more electronegative than nitrogen, the net dipole moment of is greater than

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Q.
Given below are two statements:

Statement - I: Since Fluorine is more electronegative than nitrogen, the net dipole moment of ${NF}_{3}$ is greater than ${NH}_{3}$ .

Statement - II: In ${NH}_{3}$ , the orbital dipole due to lone pair and the dipole moment of NH bonds are in opposite direction, but in ${NF}_{3}$ the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction.

In the light of the above statements, choose the most appropriate from the options given below: [2024]

1 Statement I is true but Statement II is false.

2 Both Statement I and Statement II are false.

3 Both Statement I and Statement II are true.

4 Statement I is false but Statement II is true.

Ans.
(2)

In ${NF}_{3}$ , lone pair moment and bond pair moments are in opposite direction but in ${NH}_{3}$ , lone pair moment and bond pair moments are in same direction. Hence resultant dipole moment in ${NH}_{3}$ is more.

Solution

1 Statement I is true but Statement II is false.

2 Both Statement I and Statement II are false.

3 Both Statement I and Statement II are true.

4 Statement I is false but Statement II is true.

Ans.
(2)

In ${NF}_{3}$ , lone pair moment and bond pair moments are in opposite direction but in ${NH}_{3}$ , lone pair moment and bond pair moments are in same direction. Hence resultant dipole moment in ${NH}_{3}$ is more.

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Solution

1 Statement I is true but Statement II is false.

2 Both Statement I and Statement II are false.

3 Both Statement I and Statement II are true.

4 Statement I is false but Statement II is true.

Ans. (2) In NF3, lone pair moment and bond pair moments are in opposite direction but in NH3, lone pair moment and bond pair moments are in same direction. Hence resultant dipole moment in NH3 is more.

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Ans.
(2)

In ${NF}_{3}$ , lone pair moment and bond pair moments are in opposite direction but in ${NH}_{3}$ , lone pair moment and bond pair moments are in same direction. Hence resultant dipole moment in ${NH}_{3}$ is more.