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Basic Concept of Organic Reactions Model Question Paper

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The most stable carbocation is

    (a)

    CH3-CH-CH3

    (b)

    CH3-CH-CH2-CH3

    (c)

    CH3-CH-CH2-CH2-CH3

    (d)

    CH3-CH2-CH-CH2-CH

  2. The most stable carbanion is

    (a)

    CH3-CH2

    (b)

    CH2=CH

    (c)

    CH≡ C

    (d)

    (CH3)2-CH

  3. : CH2 is an

    (a)

    Electrophile

    (b)

    Nucleophile

    (c)

    Free Radical

    (d)

    Ambiphiles

  4. The electromeric effect is

    (a)

    Permanent effect

    (b)

    Temporary effect

    (c)

    p-electrons transfer in the effect

    (d)

    Both (b) and (c)

  5. The stability of alkyl free radicals is due to

    (a)

    Hyperconjugation

    (b)

    +I effect

    (c)

    -I effect

    (d)

    Both a & b

  6. 5 x 2 = 10
  7. Write short notes on (i) +E effect and (ii) -E effect

  8. When does the carbon in an alkene molecule acquires a positive charge? Explain.

  9. Why is benzylic free radical more stable than allylic free radical?

  10. What are carbanions?

  11. Differentiate the carbocation and carbanion.

  12. 5 x 3 = 15
  13. What are the possible types of electron movement? Represent them by clearly indicating the electron shift.

  14. Explain the substitution reaction in detail with suitable examples.

  15. Which of the following compounds will not exist as resonance hybrid? Give reason for your answer.
    (i) CH3 - OH
    (ii) R-CONH2
    (iii) CH3-CH = CH-CH2NH2

  16. Write structures of various carbocations that can be obtained from 2-methyl butane. Arrange these carbocations in order of increasing stability.

  17. The structure of triphenylmethyl cation is given below. This very stable and some of its salts can be stored for months. Explain the cause of high stability of this cation.

  18. 4 x 5 = 20
  19. Explain electron movement in organic reactions.

  20. Explain the types of addition reactions?

  21. Explain the types of substitution reaction?

  22. An organic compound (A) of a molecular formula C2H4 which is a simple alkene. A reacts with dil H2SO4 to give B. A again reacts with Cl2 to give C. Identify A,B and C and write the equations.

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