Isomerism
Previous year questions with solutions · 2000 – 2026
40 Questions
26 Papers covered
2.22% ↓66.7% Weightage in 2026
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Year-wise statistics questions · papers · average per paper · weightage Year Questions Papers Avg / paper Weightage 2026 2 2 1 2.22% ↓66.7% 2025 3 1 3 6.67% ↑573.3% 2022 1 2 0.5 0.99% ↓75.2% 2021 2 1 2 4.00% ↑80% 2017 1 1 1 2.22% ↓50% 2016 4 2 2 4.44% →0% 2015 4 2 2 4.44% ↑100% 2014 1 1 1 2.22% ↓34.1% 2013 3 2 1.5 3.37% ↑169.7% 2012 1 2 0.5 1.25% ↑1.3% 2011 1 2 0.5 1.23% ↓50.6% 2010 2 2 1 2.50% ↑27.5% 2009 1 1 1 1.96% →0% 2008 1 1 1 1.96% ↓51% 2007 2 1 2 4.00% ↑100% 2006 1 1 1 2.00% ↓50% 2005 2 1 2 4.00% ↑92% 2004 1 1 1 2.08% ↓49% 2003 2 1 2 4.08% ↑104.1% 2002 1 1 1 2.00% ↓49% 2001 2 1 2 3.92% →0% 2000 2 1 2 3.92%
All 40 MCQ 39 Matching 1 TopicAll Chiral Carbon and Basic Conditions for Optical Isomerism Cis/Trans Nomenclature, E/Z Nomenclature, Syn/Anti Nomenclature Conditions and Types for Geometrical Isomerism Conformational Isomerism Elements of Symmetry (POS, COS, AOS, AAS) Isomerism in coordination compounds Number of Stereoisomers Optical Activity Without a Classical Chiral Carbon R/S Nomenclature and D/L Nomenclature Relations Between Stereoisomers Retention, Inversion and Racemisation in Reactions Structural Isomerism Tautomerism YearAll 2026 2025 2022 2021 2017 2016 2015 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000
31
Which one of the following pairs represents stereoisomerism?
Structural isomerism and geometrical isomerism Optical isomerism and geometrical isomerism Chain isomerism and rotational isomerism Linkage isomerism and geometrical isomerism. AIPMT 2005
32
The molecular formula of diphenylmethane, [figure] is C13H12. How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom?
6 4 8 7 AIPMT 2004
33
Which of the following pairs of compounds are enantiomers?
[figure] [figure] [figure] [figure] AIPMT 2003
34
In this reaction : CH3CHO + HCN CH3CH(OH)CN HOH CH3CH(OH)COOH an asymmetric centre is generated. The acid obtained would be
D-isomer L-isomer 50% D + 50% L-isomer 20% D + 80% L-isomer AIPMT 2003
35
Geometrical isomers differ in
position of functional group position of atoms spatial arrangement of atoms length of carbon chain AIPMT 2002
36
A compound of molecular formula C7H16 shows optical isomerism, compound will be
2,3-dimethylpentane 2,2-dimethylbutane 2-methylhexane none of these AIPMT 2001
37
[figure] obtained by chlorination of n-butane will be
meso form racemic mixture d-form l-form AIPMT 2001
38
2-Butene shows geometrical isomerism due to
restricted rotation about double bond free rotation about double bond free rotation about single bond chiral carbon AIPMT 2000
39
Dihedral angle in staggered form of ethane is
0 120 60 180 AIPMT 2000
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