Chemical Bonding and Molecular Structure NEET Previous Year Questions (PYQs)
Practice NEET previous year questions from Chemical Bonding and Molecular Structure. These MCQs cover hybridisation, VSEPR theory, molecular orbital theory, bond order, dipole moment, hydrogen bonding and geometry with answers and clear explanations.
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Chemical Bonding & Molecular Structure Chapter Notes
Q1. Among CN, NO, CN− and NO+, which species has the highest bond order?
(NEET 2018)
- (A) NO
- (B) NO+
- (C) CN
- (D) CN−
Show Answer
(B)
Show Explanation
NO+ has the maximum bond order (3) due to minimum antibonding electrons.
Q2. In the structure of ClF3, the number of lone pairs on the central atom is:
(NEET 2018)
- (A) One
- (B) Two
- (C) Three
- (D) Four
Show Answer
(B)
Show Explanation
ClF3 has five electron pairs (3 bond pairs + 2 lone pairs).
Q3. Which of the following pairs is isoelectronic and isostructural?
(NEET 2017)
- (A) CO and NO
- (B) NH4+ and H3O+
- (C) BF3 and NF3
- (D) SO2 and CO2
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(B)
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Both have the same number of electrons and tetrahedral geometry.
Q4. Which species has a bond angle of 120°?
(NEET 2017)
- (A) ClF3
- (B) NH3
- (C) BCl3
- (D) PH3
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(C)
Show Explanation
BCl3 is sp2 hybridised with trigonal planar geometry.
Q5. Which of the following pairs have the same bond order?
(NEET 2017)
- (A) O2 and O2−
- (B) CN− and CO
- (C) NO and NO+
- (D) CO and NO
Show Answer
(B)
Show Explanation
Both CN− and CO have bond order 3.
Q6. Which compound shows intramolecular hydrogen bonding?
(NEET 2016)
- (A) HCN
- (B) Cellulose
- (C) o-Nitrophenol
- (D) Acetic acid
Show Answer
(C)
Show Explanation
o-Nitrophenol forms intramolecular hydrogen bonding.
Q7. Correct order of repulsion is:
(NEET 2016)
- (A) bp–bp > lp–bp > lp–lp
- (B) lp–lp > lp–bp > bp–bp
- (C) lp–bp > bp–bp > lp–lp
- (D) bp–bp > lp–lp > lp–bp
Show Answer
(B)
Show Explanation
Lone pair–lone pair repulsion is maximum.
Q8. Which molecule is electron deficient?
(NEET 2013)
- (A) NH3
- (B) CH4
- (C) BF3
- (D) H2O
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(C)
Show Explanation
BF3 has only six electrons around boron.
Q9. Which molecule has maximum dipole moment?
(NEET 2014)
- (A) BF3
- (B) NF3
- (C) NH3
- (D) H2O
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(D)
Show Explanation
H2O has strong polarity and bent structure.
Q10. Which molecule is paramagnetic?
(NEET 2013)
- (A) N2
- (B) CO
- (C) O2
- (D) H2
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(C)
Show Explanation
O2 has two unpaired electrons in antibonding orbitals.
Q11. Which molecule has trigonal planar geometry?
(NEET 2014)
- (A) NH3
- (B) BF3
- (C) H2O
- (D) PCl3
Show Answer
(B)
Show Explanation
BF3 is sp2 hybridised with no lone pair on boron.
Q12. Which species does not exist?
(NEET 2020)
- (A) He2
- (B) O2
- (C) N2
- (D) H2
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(A)
Show Explanation
Bond order of He2 is zero.
Q13. Which molecule is linear?
(NEET 2006)
- (A) SO2
- (B) H2O
- (C) CO2
- (D) NH3
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(C)
Show Explanation
CO2 is sp hybridised with linear geometry.
Q14. Bond order of N2 molecule is:
(NEET 1995)
- (A) 1
- (B) 2
- (C) 3
- (D) 2.5
Show Answer
(C)
Show Explanation
N2 has a triple bond.
Q15. Which molecule has the shortest C–C bond length?
(NEET 1992)
- (A) Ethane
- (B) Ethene
- (C) Ethyne
- (D) Benzene
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(C)
Show Explanation
Triple bond has highest bond order and shortest bond length.
Q16. Strongest hydrogen bonding is present in:
(NEET 1992)
- (A) NH3
- (B) H2O
- (C) HF
- (D) H2S
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(C)
Show Explanation
HF has the highest electronegativity difference.
Q17. Which molecule has zero dipole moment?
(NEET 1994)
- (A) NH3
- (B) H2O
- (C) CO2
- (D) SO2
Show Answer
(C)
Show Explanation
CO2 is linear and symmetrical.
Q18. Which one is not a correct statement?
(NEET 2006)
- (A) Sigma bond is stronger than pi bond
- (B) Double bond is shorter than single bond
- (C) Pi bond allows free rotation
- (D) Covalent bonds are directional
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(C)
Show Explanation
Pi bond restricts rotation.
Q19. Which hybridisation gives tetrahedral geometry?
(NEET 2005)
- (A) sp
- (B) sp2
- (C) sp3
- (D) dsp2
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(C)
Show Explanation
sp3 hybridisation gives tetrahedral geometry.
Q20. According to MO theory, which molecule has only π bonds?
(NEET 2019)
- (A) O2
- (B) N2
- (C) C2
- (D) Be2
Show Answer
(C)
Show Explanation
C2 has two π bonds and no σ bond.
👉 More Chemical Bonding NEET PYQs will be added gradually.