Chemical Bonding and Molecular Structure NEET PYQs (1988–2026)

Solved Chemical Bonding and Molecular Structure PYQs

3 recent questions with answers. The full set of 143 is free to practise.

1. NEET 2026EasyMolecular Orbital Theory
   Q1

   The highest occupied molecular orbital for Ne₂ is:

   • A${\pi }_{2p}$
   • B${\sigma }_{2p}$
   • C${\pi }_{2p}^{\ast }$
   • D${\sigma }_{2p}^{\ast }$

   Show answer & solution

   Correct answer: (D)

   For Ne₂, MO configuration:
   
   ${\sigma }_{1s}^2{\sigma }_{1s}^{\ast 2}{\sigma }_{2s}^2{\sigma }_{2s}^{\ast 2}{\sigma }_{2p}^2{\pi }_{2p}^4{\pi }_{2p}^{\ast 4}{\sigma }_{2p}^{\ast 2}$.
   
   HOMO is ${\sigma }_{2p}^{\ast }$.
2. NEET 2026EasyBoiling Points and Intermolecular Forces
   Q2

   Arrange the following compounds in the increasing order of polarity:
   
   A. CH₃CH₂OCH₂CH₃
   
   B. CH₃CH₂OH
   
   C. CH₃COCH₃
   
   D. CH₃COOH

   • AA < B < C < D
   • BC < A < D < B
   • CC < A < B < D
   • DA < C < B < D

   Show answer & solution

   Correct answer: (D)

   Polarity: ether (A) < ketone (C) < alcohol (B) < carboxylic acid (D).
   
   So A < C < B < D.
3. NEET 2026MediumResonance and Canonical Structures
   Q3

   Among the following, the compound having conjugated double bonds is:

   • Ahepta-1,3-diene
   • Bhepta-1,4-diene
   • Chepta-1,5-diene
   • Dhepta-1,6-diene

   Show answer & solution

   Correct answer: (A)

   Conjugated double bonds are separated by one single bond (alternating).
   
   hepta-1,3-diene has double bonds at 1 and 3, separated by one single
   
   bond (C1=C2-C3=C4). So it's conjugated.

Topic-wise question count

Where NEET has asked from Chemical Bonding and Molecular Structure, most frequent first.

• Hybridization and Geometry43
• Molecular Orbital Theory32
• Bond Length and Strength17
• Dipole Moment11
• Isoelectronic Species11
• Bond Angles8
• Boiling Points and Intermolecular Forces7
• Resonance and Canonical Structures6
• Hydrogen Bonding5
• Lattice Energy and Ionic Compounds3

Year-wise Chemical Bonding and Molecular Structure questions in NEET

Number of questions from this chapter in each year's paper(s).