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JEE Main 202524 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
24 January
Shift
Evening Shift
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Main 2025 · 24 January · Evening Shift · Chemistry · Chemical Bonding and Molecular Structure

Given below are two statements : Statement (I): Experimentally...

Given below are two statements : Statement (I): Experimentally determined oxygen-oxygen bond lengths in the O3\mathrm{O}_3 are found to be same and the bond length is greater than that of a O=O\mathrm{O}=\mathrm{O} (double bond) but less than that of a single (O−O)(O-O) 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 ((\mathrm{O}=\mathrm{O})) but more than that of a single bond (O−O)(\mathrm{O}-\mathrm{O}). In the light of the above statements, choose the correct answer from the options given below :Given below are two statements : Statement (I): Experimentally determined oxygen-oxygen bond lengths in the O_3 are

Options

  1. ABoth Statement I and Statement II are false
  2. BStatement I is false but Statement II is true
  3. CStatement I is true but Statement II is false
  4. DBoth Statement I and Statement II are true

Correct answer

C. Statement I is true but Statement II is false

Step-by-step solution

Given below are two statements : Statement (I): Experimentally determined oxygen-oxygen bond lengths in the O_3 are
Bond length ∝1 Bond order \propto \frac{1}{\text{ Bond order }} Order of O−O\mathrm{O}-\mathrm{O} bond length O=O<O3<O−O∴\mathrm{O}=\mathrm{O} < \mathrm{O}_3 < \mathrm{O}-\mathrm{O}\therefore Statement II is true. Lone pair-lone pair repulsion between O-atoms is not solely responsible for the correct order of O-O bond length. Bond order also should be considered. ∴\therefore \quad Statement II is false.
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