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JEE Advanced 2026Paper 2
Exam
JEE Advanced
Year
2026
Paper
Paper 2
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

JEE Advanced 2026 · Paper 2 · Chemistry · Chemical Bonding and Molecular Structure

The correct order of ONO bond angle in the given species is

The correct order of ONO bond angle in the given species is

Options

  1. ANO2+<NO2<NO3−<NO2−\text{NO}_2^+ < \text{NO}_2 < \text{NO}_3^- < \text{NO}_2^-
  2. BNO2−<NO3−<NO2<NO2+\text{NO}_2^- < \text{NO}_3^- < \text{NO}_2 < \text{NO}_2^+
  3. CNO3−<NO2−<NO2<NO2+\text{NO}_3^- < \text{NO}_2^- < \text{NO}_2 < \text{NO}_2^+
  4. DNO2−<NO3−<NO2+<NO2\text{NO}_2^- < \text{NO}_3^- < \text{NO}_2^+ < \text{NO}_2

Correct answer

B. NO2−<NO3−<NO2<NO2+\text{NO}_2^- < \text{NO}_3^- < \text{NO}_2 < \text{NO}_2^+

Step-by-step solution

For NO2+\text{NO}_2^+, the central nitrogen atom is spsp hybridized with no lone pairs, resulting in a linear geometry and a bond angle of 180∘180^\circ.

For NO2\text{NO}_2, the central nitrogen atom is sp2sp^2 hybridized with one unpaired electron. The repulsion from a single electron is less than that from a bond pair, so the bond angle opens up to be greater than 120∘120^\circ (approximately 134∘134^\circ).

For NO3−\text{NO}_3^-, the central nitrogen atom is sp2sp^2 hybridized with no lone pairs, resulting in a trigonal planar geometry and a bond angle of exactly 120∘120^\circ.

For NO2−\text{NO}_2^-, the central nitrogen atom is sp2sp^2 hybridized with one lone pair. The lone pair-bond pair repulsion is greater than bond pair-bond pair repulsion, compressing the bond angle to less than 120∘120^\circ (approximately 115∘115^\circ).

Therefore, the correct order of O-N-O bond angles is NO2−<NO3−<NO2<NO2+\text{NO}_2^- < \text{NO}_3^- < \text{NO}_2 < \text{NO}_2^+.

Answer: NO2−<NO3−<NO2<NO2+\text{NO}_2^- < \text{NO}_3^- < \text{NO}_2 < \text{NO}_2^+
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