Q1 · 2000-2022 · 2 marks
Amongst the following amino acids, the (R)-enantiomer is represented by
- (a)
- (b)
- (c)
- (d)
GATE 2002
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Answer: (b)
GATE Chemistry (CY) — Stereochemistry previous year questions
15 questions · 2000 · all with verified answer · last checked 2026-11-11
Q2 · 2000-2022 · 2 marks
The configurations at the three chiral centres in the bicyclodecanol given below, are
- (a) 1S, 2S, 6R
- (b) 1S, 2S, 6S
- (c)
1R, 2S, 6R - (d) 1R, 2S, 6R GATE 2003
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Answer: (a)
Q3 · 2000-2022 · 2 marks
The absolute configurations of the two chiral centers in the following molecule are
- (a) 2(R), 3(S)
- (b) 2(R), 3(R)
- (c)
2(S), 3(S) - (d) 2(S), 3 (R)
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Answer: (a)
Q4 · 2000-2022 · 2 marks
Esterification of the acid P with the alcohol Q will give (S)-P ( \pm)-\mathrm{Q}
- (a)
Only one enantiomer - (b)
A mixture of diastereomers - (c) Amixture of enantiomers
- (d) Only one diastereomers
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Answer: (b)
Q5 · 2000-2022 · 2 marks
Among the following compounds, the one that is non-aromatic, is
- (a)
- (b)
- (c)
- (d)
GATE 2020
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Answer: (a)
Q6 · 2000-2022 · 2 marks
Bridge-head hydrogen of the conformer of cis-decalin is positioned as
- (a) a, a
- (b) e, e
- (c) a, e
- (d) pseudo-a, pseudo-e
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Answer: (c)
Q7 · 2000-2022 · 2 marks
Identify the correct stereochemical relationship amongst the hydrogen atoms \mathrm{H}_{\mathrm{a}}, \mathrm{H}_{\mathrm{b}} and \mathrm{H}_{\mathrm{c}} in the following molecule:
- (a) \mathrm{H}_{\mathrm{a}} and \mathrm{H}_{\mathrm{b}} : enantiotopic
- (b)
\mathrm{H}_{\mathrm{a}} and \mathrm{H}_{\mathrm{b}} : diastereotopic - (c) \mathrm{H}_{\mathrm{a}} and \mathrm{H}_{\mathrm{c}} : enantiotopic
- (d) \mathrm{H}_{\mathrm{b}} and \mathrm{H}_{\mathrm{c}} : diastereotopic GATE 2007
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Answer: (b)
Q8 · 2000-2022 · 2 marks
Match the entries a-d with their corresponding structures \mathrm{P}-\mathrm{S} 
- (a) bridged system (P) A - S, B - R, C - Q, D - P
- (b) atropisometric system (Q) A - P, B - S, C - Q, D - R
- (c) spiro system (R) A - Q, B - P, C - S, D - R
- (d) Fused system (S) A - S, B - R, C - P, D - Q GATE 2009
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Answer: (d)
Q9 · 2000-2022 · 2 marks
The maximum number of stereoisomers possible for the compound given below is 
GATE 2015
GATE 2015 Show answer
Answer: 4
Q10 · 2000-2022 · 2 marks
The absolute of C2 and C3 in the following compound is
- (a) 2 \mathrm{R}, 3 \mathrm{~S}
- (b) 2 \mathrm{~S}, 3 \mathrm{R}
- (c)
2 \mathrm{~S}, 3 \mathrm{~S} - (d) 2R, 3R
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Answer: (d)
Q11 · 2000-2022 · 2 marks
The number of possible stereoisomers obtained in the following reaction is ____ 
GATE 2016
GATE 2016 Show answer
Answer: 8
Q12 · 2000-2022 · 2 marks
The specific rotation of optically pure (R)-2-bromobutane is-112.00. Agiven sample of 2-bromobutne exhibited a specific rotation of-82.88. The percentage of (S)-(+)-enantiomer present in this sample is ____
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Answer: 13
Q13 · 2000-2022 · 2 marks
Among the following compounds, the number of compounds that DO NOT exhibit optical activity at room temperature is ____ . 
30. Absolute stereochemistry of the given compound is:
30. Absolute stereochemistry of the given compound is: - (a)
4 \mathrm{a}-\mathrm{S}, 8 \mathrm{a}-\mathrm{R} - (b) 4a-R, 8a-S
- (c) 4a-S, 8a-S
- (d) 4a-R, 8a-R
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Answer: 4
Q14 · 2000-2022 · 2 marks
Absolute stereochemistry of the given compound is:
- (a)
4a-S, 8a-R - (b) 4a-R, 8a-S
- (c) 4a-S, 8a-S
- (d) 4a-R, 8a-R
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Answer: (a)
Q15 · 2000-2022 · 2 marks
Among the following eight compounds, 
\left(\mathrm{H}_{3} \mathrm{C}\right)_{2} \mathrm{C}=\mathrm{C}=\mathrm{CHBr} 
The number of compound(s) which can exhibit stereoisomerism is ____ .
2 GOC GATE 2000
\left(\mathrm{H}_{3} \mathrm{C}\right)_{2} \mathrm{C}=\mathrm{C}=\mathrm{CHBr} The number of compound(s) which can exhibit stereoisomerism is ____ . | 1. | (b) | 2. | (a) | 3. | (a) | 4. | (a) | 5. | (b) | 6. | (b) | 7. | (d) |
| 8. | (b) | 9. | (d) | 10. | (d) | 11. | (a) | 12. | (a) | 13. | (c) | 14. | (c) |
| 15. | (c) | 16. | (b) | 17. | (c) | 18. | (a) | 19. | (d) | 20. | (d) | 21. | (b) |
| 22. | (4) | 23. | (d) | 24. | (8) | 25. | (a) | 26. | (b) | 27. | (d) | 28. | (13) |
| 29. | (4) | 30. | (a) | 31. | (4) | 32. | (6) |
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Answer: 6
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