Hydrocarbons Model Question Paper

11th Standard

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Which of the following is optically active

    (a)

    2 – methyl pentane

    (b)

    citric acid

    (c)

    Glycerol

    (d)

    none of these

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

    (a)

    C3H6

    (b)

    C2H2

    (c)

    C4H10

    (d)

    C2H4

  3. The major product formed when 2 – bromo – 2 – methyl butane is refluxed with ethanolic KOH is

    (a)

    2 – methylbut – 2 – ene

    (b)

    2 – methyl butan – 1 – ol

    (c)

    2 – methyl but – 1 – ene

    (d)

    2 – methyl butan – 2 – ol

  4. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?

    (a)

    – COOH

    (b)

    – NO2

    (c)

    – C ≡ N

    (d)

    – SO3H

  5. An alkane is obtained by decarboxylation of sodium propionate. Same alkane can be prepared by

    (a)

    Catalytic hydrogenation of propene

    (b)

    action of sodium metal on iodomethane

    (c)

    reduction of 1 – chloro propane

    (d)

    reduction of bromomethane

  6. 4 x 1 = 4
  7. Sodalime is the mixture of_______

    ()

    NaOH + CaO

  8. The potential energy difference between the staggered and eclipsed conformation of ethane is_________

    ()

    12.5 kJ/mol

  9. Addition of hydrohalides to alkene is an example for________

    ()

    Electrophilic addition

  10. Benzene contains_____ σ bonds and π bonds

    ()

    12,3

  11. 5 x 1 = 5
  12. Alkane

  13. (1)

    CnH2n+2

  14. Alkyne

  15. (2)

    CnH2n-2

  16. C4H10

  17. (3)

    2

  18. C3H4

  19. (4)

    1

  20. HDPE

  21. (5)

    Juice containers

    7 x 2 = 14
  22. How is propyne prepared from an alkyene dihalide?

  23. Describe the mechanism of Nitration of benzene.

  24. What happens when isobutylene is treated with acidified potassium permanganate?

  25. Describe the conformers of n - butane.

  26. Explain Markow nikoff's rule with suitable example.

  27. Write the structures of folowing alkanes.
    1) 2, 3 – Dimethyl – 6 – (2 – methyl propyl) decane
    2) 5 – (2 – Ethyl butyl) – 3, 3 – dimethyldecane
    3) 5 – (1, 2 – Dimethyl propyl) – 2 – methylnonane.

  28. How will you prepare propane from a sodium salt of fatty acid?

  29. 4 x 3 = 12
  30. Listout the uses of alkanes.

  31. Write a brief note on polymerisation of alkenes.

  32. State Huckel's rule of aromaticity and explain it interms of cyclopentadiene, cycloxtateraene and cyclopropenylcation.

  33. How to write the possible isomers of C5H12?

  34. 2 x 5 = 10
  35. Identify the compound A, B, C and D in the following series of reactions

    Write short notes on ortho, para directors in aromatic electrophilic substitution reactions.

  36. How are alkynes prepared from the following?
    (i) Alkenes
    (ii) Gem dihalides
    (iii) Potassium maleate
    (iv) Calcium carbide

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