Statement (I): For , all three possible structures may be drawn as follows. Statement (II): Structure III is most stable, as the orbitals having the lone pairs are axial, where the repulsion is minimum. [2025]

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Q.
Given below are two statements: [2025]

Statement (I): For $\underset{∙ ∙}{\overset{∙ ∙}{C}} l F_{3}$ , all three possible structures may be drawn as follows.

Statement (II): Structure III is most stable, as the orbitals having the lone pairs are axial, where the $l p - b p$ repulsion is minimum.

In the light of the above statements, choose the most appropriate answer from the options given below:

1 Statement I is incorrect but statement II is correct.

2 Statement I is correct but statement II is incorrect.

3 Both Statement I and Statement II are correct.

4 Both Statement I and Statement II are incorrect.

Ans.
(2)

In $s p^{3} d$ hybrid orbitals, more $s$ character is at axial bonds. Lone pair is more stable in orbitals with more $s$ character. Hence lone pairs are present at axial positions, for most stable structure.

Solution

1 Statement I is incorrect but statement II is correct.

2 Statement I is correct but statement II is incorrect.

3 Both Statement I and Statement II are correct.

4 Both Statement I and Statement II are incorrect.

Ans.
(2)

In $s p^{3} d$ hybrid orbitals, more $s$ character is at axial bonds. Lone pair is more stable in orbitals with more $s$ character. Hence lone pairs are present at axial positions, for most stable structure.

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Solution

1 Statement I is incorrect but statement II is correct.

2 Statement I is correct but statement II is incorrect.

3 Both Statement I and Statement II are correct.

4 Both Statement I and Statement II are incorrect.

Ans. (2) In sp3d hybrid orbitals, more s character is at axial bonds. Lone pair is more stable in orbitals with more s character. Hence lone pairs are present at axial positions, for most stable structure.

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Ans.
(2)

In $s p^{3} d$ hybrid orbitals, more $s$ character is at axial bonds. Lone pair is more stable in orbitals with more $s$ character. Hence lone pairs are present at axial positions, for most stable structure.