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Hydrocarbons Test - 6

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Hydrocarbons Test - 6
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In nitration of benzene, the active species is
  • Question 2
    1 / -0

    Ethyl benzene CANNOT be prepared by ______

    Solution

    Wurtz reaction is used to prepare alkanes with even number of carbon atoms.To prepare ethylbenzene,Wurtz Fittig reaction has to be used.

  • Question 3
    1 / -0

    The hydrocarbon which can react with sodium in liquid ammonia is------------?

    Solution

    Terminal alkynes react with Na in the presence of liquid NH3 to form  higher alkynes. The alkyne , CH2CH2C ≡ CH  contains  acidic H  at the end ( ie.the H bonded to  C1   of the chain ) . Therefore , it is  easily replaced with highly electropositive  metals such as Na in liquid ammonia , to form sodium alkylinide  ion     which can react furher in presence of suitable catalyst  to yield higher alkynes / hydrocarbons  .

  • Question 4
    1 / -0
    Which of the following methods/reactions is used for the preparation of pure methane?
  • Question 5
    1 / -0

    Among the following compounds the one that is most reactive towards electrophilic nitration is

    Solution

    Methyl group is electron donating group, hence it  increases the electron density in benzene ring thereby increasing the reactivity of the ring towards electrophilic substitution.

  • Question 6
    1 / -0

    Presence of a nitro group in a benzene ring

    Solution

    This is because the Nitro is electron withdrawing group,it pulls the electron density from the ring towards itself thereby decreasing the electron density in the ring and deactivating the ring towards attack by the electrophile.

  • Question 7
    1 / -0
    Ethyne adds a molecule of methyl alcohol in the presence of alkali to give
  • Question 8
    1 / -0

    Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

    Solution

    As we move from Cl to I,the atomic size increases,bond length increases,bond strength decreases,hence it becomes easier to release halogen and hence the order.I- is the a better leaving group.

  • Question 9
    1 / -0
    Which of the following compounds has the lowest boiling point?
  • Question 10
    1 / -0
    The correct IUPAC name of the following alkane is

  • Question 11
    1 / -0
    Which of the following is a non-aromatic compound?
  • Question 12
    1 / -0
    What is the number of acidic hydrogen atoms in 1-butyne?
  • Question 13
    1 / -0
    Choose the correct IUPAC name of the given structure.

  • Question 14
    1 / -0
    In the Newman projection for 2, 2-dimethylbutane, X and Y, respectively, will be



    A. H and H
    B. H and C2H5
    C. C2H5 and H
    D. CH3 and CH3
  • Question 15
    1 / -0
    An aqueous solution of compound A gives ethane on electrolysis. The compound A is
  • Question 16
    1 / -0
    What is the name of the reaction given below?

    C6H5Br + 2Na + BrCH3 → C6H5-CH3 + 2NaBr
  • Question 17
    1 / -0
    Which of the following compounds will exhibit geometrical isomerism?
  • Question 18
    1 / -0
    Which of the following reagents is used to distinguish between 1-butyne and 2-butyne?
  • Question 19
    1 / -0

    The compound B in the above reaction is
  • Question 20
    1 / -0
    Toluene reacts with chlorine in the presence of light to give
  • Question 21
    1 / -0

    Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?


    Solution

    (CH3)3CCH3 + HX(X = Cl,Br,I) ------------> (CH3)3CCH2X 

    Hence a monosubstituted derivative is formed.

  • Question 22
    1 / -0

    n-propyl bromide  when  treated with alcoholic KOH produces ........... ?

    Solution

    n- bromide when when treated with alcoholic KOH  produces  propene  as shown below,

  • Question 23
    1 / -0
    Ethylene reacts with Baeyer's reagent to give
  • Question 24
    1 / -0

    Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of

    Solution

    The presence of double bond on terminal carbon will give formaldehyde as one of the products.

  • Question 25
    1 / -0
    In the given configuration, C2 is rotated about C2-C3 bond anticlockwise by an angle of 120o. As a result, we get

  • Question 26
    1 / -0
    1-chlorobutane on reaction with alc. KOH gives
  • Question 27
    1 / -0

    The non-aromatic compound among the following is

    Solution

    The compound B does not satisfy the (4n+2)pi electron rule and is therefore not an aromatic compound.

  • Question 28
    1 / -0
    What would be the product formed when 1-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in ether?
  • Question 29
    1 / -0
    Which of the following compounds is the most acidic?
  • Question 30
    1 / -0

    The general formula of a cycloalkane with one benzene ring is

    Solution

    Cycloalkane wth one benzene ring has a formula C6H12
    ∴ The formula becomes
    = CnH2n

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