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JEE Main 2025 Jan 24 Shift 2, Chemistry Q7: Important Concepts Of Chemical Bonding

JEE Main2025Jan 24, Shift 2Chemistry
Q.

Given below are two statements :

Statement (I) : Experimentally determined oxygen-oxygen bond lengths in the are found to be same and the bond length is greater than that of a (double bond) but less than that of a single bond.

Statement (II) : The strong lone pair-lone pair repulsion between oxygen atoms is solely responsible for the fact that the bond length in ozone is smaller than that of a double bond but more than that of a single bond .

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

  1. A

    Statement I is true but Statement II is false

  2. B

    Both Statement I and Statement II are true

  3. C

    Both Statement I and Statement II are false

  4. D

    Statement I is false but Statement II is true

Solution

Ozone is best represented as a resonance hybrid of two equivalent Lewis structures, with the -electrons delocalised over the three-centre system. Because of this delocalisation, each O–O linkage has a bond order of , so both bonds are identical and their length lies between a pure single bond (148 pm) and a pure double bond (121 pm). Statement I is correct.

The intermediate bond length is therefore explained by resonance / delocalised -bonding, not by lone pair-lone pair repulsion. Lone pair repulsion influences bond angle but is not the reason for the observed bond length. Statement II is incorrect.

Correct option: (1)

Concept behind this question

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