Q1 · 2005-2022 · 2 marks
After the following interchanging of groups in the Fischer projection of 2-bromobutane, the configuration of (\mathrm{X}) and (Y) will be
- (a) \mathrm{X}=\mathrm{R}, \mathrm{Y}=\mathrm{S}
- (b)
X=R, Y=R - (c)
\mathrm{X}=\mathrm{S}, \mathrm{Y}=\mathrm{R} - (d)
\mathrm{X}=\mathrm{S} ; \mathrm{Y}=\mathrm{S}
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Answer: (c)
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Q2 · 2005-2022 · 2 marks
The maximum number of stereoisomers possible for 4-phenylbut-3-en-2-ol is
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Answer: (d)
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Q3 · 2005-2022 · 2 marks
Which of the following is achiral?
- (a) Alanine
- (b) Glycine
- (c) Proline
- (d) Phenylalanine
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Answer: (b)
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Q4 · 2005-2022 · 2 marks
Benzene and Dewar benzene are
- (a) Canonical forms
- (b) Structural isomers
- (c) Tautomers
- (d) Conformational isomers
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Answer: (b)
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Q5 · 2005-2022 · 2 marks
The most stable conformation of the molecule shown below is correctly represented by
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Answer: (d)
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Q6 · 2005-2022 · 2 marks
The optically active stereoisomer of the following compound is
- (a)
- (b)
- (c)
- (d)
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Answer: (b)
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Q7 · 2005-2022 · 2 marks
Which one among the following molecules is chiral?
- (a)
- (b)
- (c)
- (d)
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Answer: (c)
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Q8 · 2005-2022 · 2 marks
The number of all possible isomers for the molecular formula \mathrm{C}_{6}\mathrm{H}_{14} is ____.
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Answer: 5
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Q9 · 2005-2022 · 2 marks
Catalytic hydrogenation of the following compound produces saturated hydrocarbon(s). The number of stereoisomer(s) formed is
- (a) 1
- (b) 2
- (c)
3 - (d) 4
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Answer: (c)
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Q10 · 2005-2022 · 2 marks
The number of compounds having S-configuration among the following is ____ . 
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Answer: 4
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Q11 · 2005-2022 · 2 marks
Among the dimethylcyclohexanes, which one can be obtained in enantiopure form?
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Answer: (a)
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Q12 · 2005-2022 · 2 marks
The number of stereoisomers possible for the following compound is ____ . www.vigyanvriksh.com 6 For more info contact us :9717270400 
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Answer: 3
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Q13 · 2005-2022 · 2 marks
The number of gauche-butane interaction(s) in the following compound is ____ . 
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Answer: 3
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Q14 · 2005-2022 · 2 marks
The dihedral (torsional) angle (in degrees) between the two methyl groups in the most stable conformation of n-butane is ____ (Round off to nearest integer)
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Answer: 1800
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Q15 · 2005-2022 · 2 marks
Total number of constitutional isomers possible for trimethyl cyclohexane is ____.
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Answer: 6
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Q16 · 2005-2022 · 2 marks
For the molecule, \mathrm{CH_3{-}CH{=}CH{-}CH(OH){-}CH{=}CH{-}CH{=}C(CH_3)_2} the number of all possible stereoisomers is ________.
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Answer: 8
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