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Practice on Isomerism



Start practice on Isomerism


1. Structural Isomerism

1. The total number of possible isomeric trimethylbenzene is. 
  1. 4
  2. 6
  3. 2
  4. 3
     
ans : d

2. C7H9N has how many isomeric forms that contain a benzene ring.
  1. 7
  2. 5
  3. 6
  4. 4
     
ans : b

3. C6H5CN  and  C6H5NC  exhibt which type of isomerism
  1. Functional
  2. Dextro isomerism
  3. Position
  4. Metamerism
     
ans : a

4.  Find the pair of chain isomer 
  1. CH3CHBr2  and CH2BrCH2Br
  2. 1-propanl and 2-propanol
  3. Neo-pentane and isopentane
  4. Diethyl ether and methyl-n-propyl ether
     
ans : c

5. Functional isomerism is exhibited by the following pair of compounds
  1. Acetone, propionaldehyde
  2. Diethyl ether, methyl propyl ether 
  3. Butane, isobutane
  4. 1-butene, 2-butene
     
ans : a

6.The isomerism exhibited by alkyl cyanide and alkylisocyanide is
  1. Functional
  2. position
  3. Tautomerism
  4. Metamerism
     
ans : a

7. n-propyl alcohol and isopropyl alcohol are examples of
  1. position isomerism
  2. Chain isomerism
  3. Tautomerism
  4. Geometrical isomerism
     
ans : a

8. Diethyl ehter and methyl-n-propyl ether are
  1. position isomers
  2. Functional isomers
  3. Metamers
  4. Chain isomers
     
ans : c

9.The number of possible alcoholic isomer for C4H10O are
  1. 4
  2. 2
  3. 3
  4. 5
     
ans : a

10. Diethyl ether is not associated with which one of these isomers
  1. Butanoic acid
  2. Methyl propionate
  3. Stereoisomerism
  4. None of these
     
ans : d

11. Total structural isomer of molecular formula C5H10  is
  1. 10
  2. 11
  3. 12
  4. 13
     
ans : a

12. Which is not  found in alkenes ?
  1. Chain isomerism
  2. Geometrical isomerism
  3. Metamerism
  4. Position isomerism
     
ans : c

13. How many isomers of C5H11OH  will be primary alcohols ?
  1. 2
  2. 3
  3. 4
  4. 5
     
ans : c

14. An alkane forms isomers if the number of least carbon atom is
  1. 1
  2. 2
  3. 3
  4. 4
     
ans : d

15. Dimethyl ether and ethyl alcohol are 
  1. Metamers
  2. Homologues
  3. Functional isomers
  4. Position isomers
     
ans : c

16. Methyl acetate and propionic acid are
  1. Functional isomer
  2. Structural isomer
  3. Stereoisomer
  4. Geomatrocal isomer
     
ans : a

17. What is the maximum number of open chain structures possible for C4H8
  1. 1
  2. 3
  3. 2
  4. 4
     
ans : b

18. Isomerism shown by


  1. Position isomerism
  2. chain isomerism
  3. Metamerism
  4. Optical isomerism
     
ans : c

2. Tautomerism

1.Ethyl acetoacetate shows which type of isomrism
  1. Chain 
  2. Optical
  3. Metamerism
  4. Tautomerism
     
ans : d

2. Which of the following compound does not undergo base-catalyzed exchange in H2O even thought it has an alpha-hydrogen


     
ans : d

3. Which among the following compound will give maximum enol content in solution ?


     
ans : a

4. Tautomerism is exhibited by

     
ans : a

5. Identify most stable form of terreic acid


     
ans : c

6. The total number of enolizable H-atom in the compound


  1. 4
  2. 6
  3. 5
  4. 8
     
ans : b

7. Keto-enol tautomerism is observed in


     
ans : b

8. Which can show tautomerism


     
ans : d

9. Which of the following has highest % enol content in the liquid


     
ans : b

3.Geometrical Isomerism


1. Geometrical isomerism is not possible in
  1. Propene
  2. 3-hexene
  3. Butenedioic acid
  4. None of these
     
ans : a

2. Which of the following compounds will exhibit geometrical isomerism ?
  1. 1-phenyl-2-butene
  2. 3-phenyl-1-butene
  3. 2-phenyl-1-butene
  4. 1,1-Diphenyl-1-propene
     
ans : a

3. Cis- and trans-2-butene are
  1. Conformational isomers
  2. Optical isomers
  3. Position isomers
  4. Geometrical isomers
     
ans : d

4. Which pair show cis-trans isomerism ?
  1. Maleic-fumaric acid
  2. Lactic-tartaric acid
  3. Malonic-scccinic acid
  4. Crotonic-acrylic acid
     
ans : a

5. 1,2-Dichlororthane shows
  1. Geometrical isomerism
  2. Optical Isomerism
  3. Ring-chain isomerism
  4. Resonance
     
ans : a

6. Which compound does not show geometrical isomerism
  1. 2-butene
  2. 2-pentene
  3. 2,3-dibromo-2-butene
  4. 2-methyl propene
     
ans : d

7. Which of the following shows cis-trans isomerism


     
ans : b

8. The following compound can exhibit


  1.  Tautomerism
  2. Optical isomerism
  3. Geometrical isomerism
  4. Geomaterical and optical isomerism
     
ans : b

9. Which of the following will not show geometrical isomerism ?


     
ans : b

10. The number of possible isomers of butane is
  1. 3
  2. 2
  3. 4
  4. 5
     
ans : a

4.Optical isomerism


1. Which of the following is an optically active compound ?
  1. n-propanol
  2. 2-chlorobutane
  3. n-butanol
  4. 4-hydroxyheptane
     
ans : b

2.Number of optical isomers of lactic acid are.
  1. 1
  2. 2
  3. 3
  4. 4
     
ans : b

3. Which of the following pairs represent the steroisomerism ?
  1. Molecular symmetry
  2. Molucular asymmetry
  3. External compensation
  4. Two asymmetric C-atoms
     
ans : a

4. Molecular weight of a hydrocarbon containing minimum number of C-atom to show optical isomerism.
  1. 100
  2. 80
  3. 68
  4. 70
     
ans : c

5. The chirality of the compound


  1. R
  2. S
  3. Z
  4. I
     
ans : a

6. Which of the following shows optical activity


     
ans : b

7. Which of the following compounds may not exist as enantiomers?


     
ans : c

8. Which of the following contains asymmetric center ?
  1. 2-butene
  2. 2,2-dimethylpropane
  3. 2-hexyne
  4. Lactic acid
     
ans : d

9. Optically active isomers but not mirror images are called .
  1. Enantiomers
  2. Mesomers
  3. Tautomers
  4. Diastereoisomers
     
ans : d

10. The isomers which can be converted into another forms by rotation of the molecules around single bond are
  1. Geometrical isomers
  2. conformers
  3. Enantiomers
  4. diastereomers
     
ans : b

11. Which of the following may exist in enantiomorphs?


     
ans : d

12. Which of the following compounds shows optical isomerism ?


     
ans : a

13. Optically active compound is
  1. 3-chloropentane
  2. 2-chlorobutane
  3. 2-chloropropane
  4. None of these
     
ans : b

14. Which of the following is a chiral compound ?
  1. Hexane
  2. Methane
  3. n-butane
  4. 2,3,4-trimethyl hexane
     
ans : d

15. Glucose and fructose are
  1. Optical isomers
  2. Functional isomers
  3. Position isomers
  4. Chain isomers
     
ans : b

16. Which compound is optically active?
  1. 4-chloro, 1 hydroxy butane
  2. 3'-butyl alcohol
  3. secondary butyl alcohol
  4. n-butyl alcohol
     
ans : c

17. Which of the following compounds is not chiral ?


     
ans : a

18. Which will have enantiomer ?


     
ans : a

19. Relation between A and B


  1.  Enantiomer
  2. Diastereomer
  3. Identical
  4. Structural isomer
     
ans : b

20. Which of the following representation have a R configuration


     
ans : 1

5. Conformational Isomerism


1. Which of the following cycloalkanes exhibits the greatest molar heat of combustion per -CH2-group ?
  1. Cyclopropane
  2. Cyclopentane
  3. Cyclobutane
  4. Methylcyclobutane
     
ans : c

2.  If C2 in given compound is rotated by 120' angle is anticlockwise direction along C2 - C3 , which of the following form will be produced:


  1. Partial eclipsed
  2. Prefectly eclipsed
  3. Perfectly staggered
  4. Gauche conformation
     
ans : d

3. The most stable conformer of 2-methyl propane is:


     
ans : 2

4. Least hindered rotation about C-C bond is observed in
  1. Ethane 
  2. Ethylene
  3. Ethyne
  4. Hexachloroethane
     
ans : a

5. Which statement is true for cyclohexane
  1. it has two possible isomers
  2. it has three conformations
  3. Boat conformation is most stable
  4. Chair and boat conformations differ in energy by 44 kj/mol
     
ans : d

6. In ethane and cyclohexane which one of the following pairs of conformations are more stable ?
  1. Eclipsed and chair conformations
  2. Staggered and chair conformations
  3. Staggered and boat conformations
  4. Eclipsed and boat conformations
     
ans : b

7. Which of the following is the diastereomer of the compound


     
ans : d

8. Which of the following molecule exhibits conformational isomerism ?
  1. CH2O
  2. CF4
  3. CH3OH
  4. CH4
     
ans : a

9. The most stable conformation of 3-fluorobutan-2-ol is:
  1. Fully eclipsed form
  2. Partially eclipsed form
  3. Gauche form
  4. Anti form
     
ans : c

10. The structure below are


  1. not isomers
  2. structural isomers
  3. enantiomers
  4. conformers
     
ans : b

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