31
The chirality of the compound [figure]
- R
- S
- E
- Z
AIPMT 2005
Isomerism
Previous year questions with solutions · 2000 – 2026
40Questions
26Papers covered
2.22% ↓66.7%Weightage in 2026
’00
’01
’02
’03
’04
’05
’06
’07
’08
’09
’10
’11
’12
’13
’14
’15
’16
’17
’21
’22
’25
’26
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% |
32
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
33
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
34
Which of the following pairs of compounds are enantiomers?
- [figure]
- [figure]
- [figure]
- [figure]
AIPMT 2003
35
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
36
Geometrical isomers differ in
- position of functional group
- position of atoms
- spatial arrangement of atoms
- length of carbon chain
AIPMT 2002
37
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
38
[figure] obtained by chlorination of n-butane will be
- meso form
- racemic mixture
- d-form
- l-form
AIPMT 2001
39
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
40
Dihedral angle in staggered form of ethane is
- 0
- 120
- 60
- 180
AIPMT 2000