Question Bank No: 1

1. d and l forms of tartaric acid are mixed in equal proportions. The mixture is called

 a)Utectic mixture
 b)Azeotropic mixture
 c)Diastereomers mixture
 d)Racemic mixture

2. A certain compound contain three chirality centers. The maximum number of stereoisomers it can have is

 a)8
 b)6
 c)9
 d)3

3. The simplest alcohol that can exhibit enantiomerism is

 a)1-Propanol
 b)1-Butanol
 c)2-Propanol
 d)2-Butanol

4. Which of the following does not contain any asymmetric carbon but can show enantiomerism?

 a)Lactic acid
 b)1,3-Pentadiene
 c)Tartaric acid
 d)2,3 -Pentadiene

5. A compound whose molecules are superimposable on their morror images even through they contain asymmetric carbon atoms is called

 a)A threo compound
 b)An erythro compound
 c)A dissymmetric compound
 d)A meso compound

6. Which of the following can exist as diastereomers?

 a)Lactic acid
 b)1-Butene
 c)2-Butene
 d)Ethane

7. Which of the following isomerisms is shown by alkenes but not by alkanes?

 a)Conformational
 b)Optical
 c)Geometric
 d)Chain

8. The energy difference between staggered and eclipsed conformations of ethane is about

 a)25kJ/mole
 b)30kJ/mole
 c)100kJ/mole
 d)12.5kJ/mole

9. Which of the following compounds is expected to be most reactive?

 a)Cyclohexane
 b)Cyclopropane
 c)Cyclobutane
 d)Cyclopentene

10. The dihedral angle between two methyl groups in eclipsed conformation of n-butane is

 a)1800
 b)1200
 c)900
 d)109028'

11. Which of the following conformations of n butane is the least stable?

 a)Gauche
 b)Anti
 c)Eclipsed
 d)Fully eclipsed

12. Anthracene is isomeric with

 a)Phenanthrene
 b)Naphthalene
 c)Benzene
 d)None

13. The number of dichloro derivatives of naphthalene is

 a)ten
 b)fourteen
 c)six
 d)five

14. Which of the following alkanes can from only two monochloro derivatives?

 a)Hexane
 b)2-methyl pentane
 c)2, 3-Dimethylbutane
 d)3-Methyl pentane

15. How many structural isomers are of C4H10O?

 a)6
 b)7
 c)4
 d)5

16. n-Butane and iso-butane are ......... isomers

 a)Chain
 b)Position
 c)Geometric
 d)Optical

17. The simplest alkane capable of exhibiting chain isomerism has ........ carbon atoms

 a)three
 b)five
 c)four
 d)six

18. Which isomer of C6H14 has two isopropyl groups?

 a)20 Methyl pentane
 b)3-Methyl pentane
 c)2,3-Dimethylbutane
 d)2,2-Dimethylbutane

19. How many structures can compounds with a molecular formula C 7 H 9 N have?

 a)5
 b)4
 c)3
 d)2

20. Which of the following structure are chiral ?
(i)stereochemistry-q10i (ii) stereochemistry-q10ii (iii) stereochemistry-q10iii

 a)(i) and (iii)
 b)all the three
 c)(i) and (ii)
 d)(ii) and (iii)

21. Maleic acid and fumaric acid are

 a)Homologous
 b)Geometrical isomers
 c)Enantiomers
 d)Diastereomers

22. The process of separation of (d,l) -mixture into its constituent is referred to

 a)Fractional distillation
 b)Resolution
 c)Fragmentation
 d)Sedimentation

23. Which of the following is responsible for the inability of meso compound to show optical activity ?

 a)Absence of chirality centre
 b)Presence of more than one chirality centre
 c)Dissymmetric nature of its structure
 d)Internal Compensation

24. d and l forms of tartaric acid are mixed in equal proportions. The mixture is called

 a)Utectic mixture
 b)Azeotropic mixture
 c)Diastereomers
 d)Racemic mixture

25. Acertain compound contain three chirality centres. The maximum number of steriosomers it can have is

 a)8
 b)6
 c)9
 d)3

26. The instrument used for measuring specific rotation is

 a)Spectrometer
 b)Polarimeter
 c)Lactometer
 d)Ammeter

27. The angel of rotation of plane polarized light in polarimeter depends upon

 a)Cone of the substance
 b)Length of the tube
 c)Nature of the Substance
 d)All of these

28. Which of the following compounds can exist in meso-form ?

 a)1, 2-Dichlorobutane
 b)2, 3-Dichloropentane
 c)2,3-Dichlorobutane
 d)1, 2-Dichloropentane

29. +)-Tartaric acid and meso-tartaric acid are

 a)Enantiomers
 b)Diastereomers
 c)Geometric isomers
 d)None of these