Page 1 of 3 CCP - SANKALP_ISOM -26-PH-IV
CPP
ISOMERISM (ENATIOMER, DIASTERIOMERS & MESOMERES) – SHEET - 26
LEVEL - 1
1. Select the optically active compound among the following:
NH H3C COOH
(A) HN (B) H3C COOH
H3 C CH3 HN NH
(C) HOOC COOH (D)
OC CO
2. Which species exhibits a plane of symmetry?
(A) (B)
(C) (D)
3. Number of possible 3D-isomers (stereoisomers) of glucose are
(A) 10 (B) 14
(C) 16 (D) 20
4. During debromination of meso dibromobutane, the major compound formed is:
(A) n-butane (B) 1-butene
(C) trans-2-butene (D) cis-2-butene
5. Which of the following have asymmetric carbon atom?
C l Br H Cl
| | | |
(A) HCCH (B) H C C Cl
| | | |
H H H H
H Cl H H
| | | |
(C) HCCH (D) H C C CH 3
| | | |
H H Br OH
6. Meso-tartaric acid and d-tartaric acid are
(A) positional isomers (B) enantiomers
(C) diastereomers (D) racemic mixture
7. The number of optically active compound in the isomers of C4H9Br is
(A) 1 (B) 2
(C) 3 (D) 4
8. How many stereoisomers an exist for the following acid
H C(OH).CO 2 H
|
H C.CO 2 H
|
H C(OH).CO 2 H
(A) Two (B) Four
(C) Eight (D) Sixteen
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Page 2 of 3 CCP - SANKALP_ISOM -26-PH-IV
9. Me
Me H
H
H
Me
Hydrogenation of the above compound in the presence of poisoned palladium catalyst gives:
(A) optically active compound (B) an optically inactive compound
(C) a racemic mixture (D) a diastereomeric mixture
10. An enantiomerically pure acid is treated with racemic mixture of an alcohol having one chiral carbon. The
ester formed will be:
(A) optically active mixture (B) pure enantiomer
(C) meso compound (D) racemic mixture
LEVEL - 2
11. The reaction sequence
O
H
H3C COOH
C CH CH2
H3C
CH2CH3
will yield
(A) a pair of product that are enantiomers (B) a single product that is optically active
(C) a pair of products that are diastereomers (D) a pair of products one of which is meso
12. The number of optically active products obtained from the complete ozonolysis of the given compound, is
CH3 H
H3C CH CH C CH CH C CH CHCH3
CH3 CH3
(A) 0 (B) 1
(C) 2 (D) 4
13. Which of the following pairs can be resolved?
(A) (B)
(C) (D)
14. Which out of the following are resolvable.
(A) (B)
(C) (D)
15. The number of possible enantiomeric pairs that can be produced during monochlorination of 2-
methylbutane is:
(A) 2 (B) 3 (C) 4 (D) 1
16. The major product from the reaction of Br2 with Z-3 hexeneis:
(A) optically active (B) racemic mixture
(C) meso form (D) both racemic mixture and meso form
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Page 3 of 3 CCP - SANKALP_ISOM -26-PH-IV
ANSWER KEY ISOMERISM – SHEET – 26
1. B
2. D
3. C
4. C
5. D
6. C
7. B
8. B
9. B
10. A
11. C
12. A
13. B, C, D
14. D
15. A
16. B
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