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11th Chemistry - Basic concept of organic reactions Model Question Paper Oct-09 , 2019

Basic concept of organic reactions 

11th Chemistry - Basic concept of organic reactions Model Question Paper

Basic concept of organic reactions Model Question Paper

11th Standard

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Chemistry

Time : 02:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

  1. What is the hybridisation state of benzyl carbonium ion ?

    (a)

    sp2

    (b)

    spd2

    (c)

    sp3

    (d)

    sp2d

  2. Which of the following species is not electrophilic in nature ?

    (a)

    Cl+

    (b)

    BH3

    (c)

    H3O+

    (d)

    +NO2

  3. Which of the group has highest +I effect ?

    (a)

    CH3-

    (b)

    CH3 - CH2 -

    (c)

    (CH3)2 - CH-

    (d)

    (CH3)3 - C-

  4. Which of the following carbocation will be most stable ?

    (a)

    Ph3C-+

    (b)

    \({ C }{ H }_{ 3 }-\overset { + }{ C } { H }_{ 2 }\)

    (c)

    \(\left( { CH }_{ 3 } \right) _{ 2 }-\overset { + }{ C } { H }\)

    (d)

    \(CH_{ 2 }=CH-\overset { + }{ C } { { H }_{ 2 } }\)

  5. The geometrical shape of carbocation is ______________.

    (a)

    Linear

    (b)

    tetrahedral

    (c)

    Planar

    (d)

    Pyramidal

    6. 5 x 1 = 5

  6. The slowest step in the mechanism determines_________

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    Rate of reaction

  7. During the cleavage of Azobisisobutyronitrile produces,______species

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    Free radical

  8. The cleavage of C-H bond in aldehydes leads to formation of_______

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    Carbanion

  9. Example for positive mesomeric effect is_________

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    -OH

  10. Alcohol on refluxing with K2Cr2O7 gives________

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    Carboxylic acid

    11. 2 x 2 = 4

  11. Assertion (A) : The C- C bond in ethane is non-polar while the C- C bond in ethyl chloride is polar.
    Reason (R) : Chlorine is more electronegative than carbon and hence it attracts the shared pair of electron between C - Cl in ethyl chloride and it develops a negative charge on Cl and positive charge on Carbon.
    (a) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
    (b) Both (A) and (R) arecorrect and (R) is the correct explanation of (A).
    (c) (A) is correct but (R) is wrong.
    (d) (A) is wrong but (R) is correct.

  12. Assertion (A) : The cut apple turns brown.
    Reason (R) : Cut apple exposes its cells to atmospheric oxygen and the oxidises the phenolic compound present in it. Due to this enzymatic browning, the cut apple turns brown.
    (a) Both (A) and (R) are correct but (R) is not the correct explanation of (A).
    (b) Both (A) and (R) are correct and (R) is the correct explanation of (A).
    (c) (A) is correct but (R) is wrong.
    (d) (A) is wrong but (R) is correct.

    13. 2 x 2 = 4

  13. (a) NH3
    (b) H2O
    (c) CN- 
    (d) RSH

  14. (a) - C(CH3)3
    (b) - COOH
    (c) - CH(CH3)2
    (d) - COO

    15. 8 x 2 = 16

  15. What are electrophiles and nucleophiles ? Give suitable examples for each.

  16. Explain inductive effect with suitable example.

  17. Explain electromeric effect.

  18. Draw the resonating structure of C6H5NH2 .

  19. Define resonance effect.

  20. Why does SO3 act as an electrophile ?

  21. Mention the types of fission of a covalent bond?

  22. What are carbocations?

    23. 2 x 3 = 6

  23. Distinguish between electrophiles and nucleophiles

  24. Explain the different types of substitution reactions or displacement reactions.

    25. 2 x 5 = 10

  25. Explain electron movement in organic reactions.

  26. Explain the types of addition reactions ?

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