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NEET CHEMISTRYChemical Bonding and Molecular StructureEasy

Question

Which of the following molecule does not possess a π\pi bond?

A

H₂O

B

SO₂

C

NO₂

D

CO₂

Step-by-Step Solution

  1. Analyze H2OH_2O (Water): The central Oxygen atom is bonded to two Hydrogen atoms via single covalent bonds. Oxygen is sp3sp^3 hybridized with two lone pairs and two bond pairs. Single bonds are always sigma (σ\sigma) bonds. There are no multiple bonds, hence no π\pi bonds are present.
  2. Analyze CO2CO_2: Structure is O=C=OO=C=O. Each double bond consists of one σ\sigma and one π\pi bond. Total = 2 π\pi bonds.
  3. Analyze SO2SO_2: Structure involves resonance between O=S−OO=S-O forms. It contains S=OS=O double bond character, implying the presence of a π\pi bond.
  4. Analyze NO2NO_2: Structure contains a nitrogen atom double-bonded to an oxygen atom in its resonance hybrid (O=N−O⋅O=N-O^{\cdot}). It possesses a π\pi bond.
  5. Conclusion: Only water (H2OH_2O) lacks a π\pi bond.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Chemical Bonding and Molecular Structure. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

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