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11th Standard Chemistry Hydrocarbons English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. The correct statement regarding the comparison of staggered and eclipsed conformations of ethane is

    (a)

    the eclipsed conformation of ethane is more stable than staggered conformation even though the eclipsed conformation has torsional strain

    (b)

    the staggered conformation of ethane is more stable than eclipsed conformatio, because staggered conformation has no torsional strain

    (c)

    the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has torsional strain

    (d)

    the staggered conformation of ethane is less stable than eclipsed conformation, because staggered conformation has no torsional strain

  2. In the following reaction,

    The major product obtained is

    (a)

    (b)

    (c)

    (d)

  3. The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are

    (a)

    CH4 and H2

    (b)

    CH4 and CO2

    (c)

    C2H6 and CO2

    (d)

    C2H4 and Cl2

  4. The compound that will react most readily with gaseous bromine has the formula

    (a)

    C3H6

    (b)

    C2H2

    (c)

    C4H10

    (d)

    C2H4

  5. Which among the following alkenes on reductive ozonolysis produces only propanone?

    (a)

    2 – Methyl propene

    (b)

    2 – Methyl but – 2 - ene

    (c)

    2, 3 – Dimethyl but – 1 – ene

    (d)

    2, 3 – Dimethyl but – 2 – ene

  6. Major product of the below mentioned reaction is,
    \({ \left( { CH }_{ 3 } \right) }_{ 2 }C={ CH }_{ 2 }\overset { ICl }{ \longrightarrow } \)

    (a)

    2–chloro –1– iodo – 2 – methyl propane

    (b)

    1–chloro–2–iodo–2–methylpropane

    (c)

    1,2 – dichloro – 2 – methyl propane

    (d)

    1, 2 – diiodo – 2 – methyl propane

  7. Cis – 2 – butene and trans – 2 – butene are

    (a)

    conformational isomers

    (b)

    structural isomers

    (c)

    configurational isomers

    (d)

    optical isomers

  8. \(\underset { \overset { | }{ Br } }{ { CH }_{ 2 } } -\underset { \overset { | }{ Br } }{ { CH }_{ 2 } } \overset { \left( A \right) }{ \longrightarrow } CH\equiv CH,\) where A is,

    (a)

    Zn

    (b)

    Conc H2SO4

    (c)

    alc. KOH

    (d)

    dil H2SO4

  9. The difference in potential energy between eclipsed and staggered form of ethane is.

    (a)

    4 kJ/mol

    (b)

    12.55 kJ/mol

    (c)

    2 kJ/mol

    (d)

    44 kJ/mol

  10. Tbe angle strain in cyclopentane is

    (a)

    72°

    (b)

    1°28'

    (c)

    44'

    (d)

    108°

  11. In which alkane isomerization will not occur?

    (a)

    C2H6

    (b)

    C4H10

    (c)

    C5H10

    (d)

    C6H14

  12. In an attempt to prepare propane by Wurtz reaction 1 mole of methyl bromide and 1mole of ethyl bromide are treated with sodium. Assuming equal probability for all possible reaction. How many 'g' of propane will be obtained?

    (a)

    44 g

    (b)

    22 g

    (c)

    33 g

    (d)

    14.67 g

  13. Which of the following conformers for ethylene glycol is most stable?

    (a)

      

    (b)

      

    (c)

      

    (d)

      

  14. Total number of conformations possible in cyclohexane is

    (a)

    Zero

    (b)

    Infinite

    (c)

    Four

    (d)

    Two

  15. Which of the following is the most stable cycloalkane?

    (a)

    (b)

    (c)

    (d)

  16. Torsion strain is the repulsive interaction between

    (a)

    Electron cloud of two bonds

    (b)

    Electron cloud of two \(\sigma \)-bonds

    (c)

    Electron cloud of two \(\pi\)-bonds

    (d)

    Electron cloud of two \(\sigma \)-bonds on adjacent atoms

  17. CH3 - CH = CH2 + HBr \(\overset { Benzoyl\ peroxide }{ \underset { hv }{ \longrightarrow } } \)Products which of the following is a possible product in the above reaction?

    (a)

    CH3 - CH2 - CH2 - Br

    (b)

    \({ CH }_{ 3 }-\underset { \overset { | }{ Br } }{ CH } -{ CH }_{ 2 }-Br\)

    (c)

    \({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 2 } } }{ CH } -\underset { \overset { | }{ Br{ CH }_{ 2 } } Br }{ CH } -{ CH }_{ 3 }\)

    (d)

    All of these

  18. How many structural isomers are possible for the molecular formula C4H8 which can undergo ozonolysis?

    (a)

    2

    (b)

    4

    (c)

    3

    (d)

    1

  19. Carbon-carbon bond length in benzene is

    (a)

    1.39 A

    (b)

    1.09 A

    (c)

    1.54 A

    (d)

    1.34 A

  20. Which of the following is the most reactive towards electrophilic substitution reaction?

    (a)

    (b)

     

    (c)

    (d)

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