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Hydrocarbons Test - 16

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Hydrocarbons Test - 16
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Weekly Quiz Competition
  • Question 1
    1 / -0

    in the Wurtz reaction method of preparation of alkanes, the stoichiometric coefficient of Sodium is

    Solution

    2 Na atoms are used.

  • Question 2
    1 / -0

    When two hydrogen atoms in benzene are replaced by two similar or different monovalent atoms or groups, how many different position isomers are possible?

    Solution

    Ortho , meta and para.

  • Question 3
    1 / -0

    Which of the following reactions of methane is incomplete combustion?

    Solution

     is incomplete combustion.

  • Question 4
    1 / -0

    The hydrocarbon which can react with sodium in liquid ammonia is

    Solution

    https://cdn3.edurev.in/ApplicationImages/Temp/509076_5e2eb12b-ba99-4404-af08-3c226bf23be0_lg.png

    It is a terminal alkyne, having acidic hydrogen.

  • Question 5
    1 / -0

    n-Propylbromide on treatment with ethanolic KOH is

    Solution

    Elimination reaction takes place.

  • Question 6
    1 / -0

    The number of possible conformational isomers of ethane is

    Solution

    Infinite conformational isomers of ethane is possible since continuous rotations around C-C bond is there.

  • Question 7
    1 / -0

    The unusual behavior of benzene is explained by

    Solution

    Continuous delocalization of pi electron or resonace in benzene

  • Question 8
    1 / -0

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

    Solution

    Methyl group is electron donating group, hence increase electron density in benzene ring.

  • Question 9
    1 / -0

    The treatment of CH3MgX with CH3C ≡ C−H produces

    Solution

    Methane is produced by reaction with grignard reagent.

  • Question 10
    1 / -0

    Acetylene is prepared by the action of water on

    Solution

    Ethyne gas(Acetylene) is prepared in the laboratory by the action of water on calcium carbide.

    CaC2 +  2H2O  ----------> C2H2 + Ca(OH)2   

  • Question 11
    1 / -0

    boiling point of alkanes

    Solution

    As molecular mass increase boiling point increases.

  • Question 12
    1 / -0

    Aromatics are charachterized by the presence of _____ π electrons in the ring where n is an integer (n = 0, 1, 2, . . .).

    Solution

    Huckel rule.

  • Question 13
    1 / -0

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

    Solution

    Neopentane with Cl2​ and monohalogenation gives single product.

  • Question 14
    1 / -0

    Benzene reacts with chlorine in sunlight to give a final product

    Solution

     In this reaction we are not using AlCl3​ we are using direct Cl2​ gas in presence of strong radiation-Ultraviolet which is then able to break open the double bonds of the benzene ring and facilitate the approach of the reactive intermediate of chlorine, most probably a free radical of Cl. since it is believed if the reaction proceeds by free radical mechanism this way all the carbons of benzene will have equal share of electron (moreover in the space freons disturbs ozone layer because they are able to form free radicals with UV rays). So it is believed it proceeds via free radical mechanism and hence form gammaexane(gamma isomer) with other minor isomers of C6​Cl6​H6​.

  • Question 15
    1 / -0

    What is the product obtained on electrolyzing potassium fumarate?

    Solution

    Ethyne (C2H2) and CO2.accompanied with the formation of KOH and H2.

    Hence B is correct.

  • Question 16
    1 / -0

    Halogenation of alkanes is a

    Solution

    Alkane halogenation is an example of a substitution reaction, a type of reaction that often occurs in organic chemistry. A substitution reaction is a chemical reaction in which part of a small reacting molecule replaces an atom or a group of atoms on a hydrocarbon or hydrocarbon derivative.

  • Question 17
    1 / -0

    What is the commercially used method to produce benzene?

    Solution

    All of the mentioned methods can be used but the commercially used method is from the isolation from coal tar.

  • Question 18
    1 / -0

    Ethyl benzene CANNOT be prepared by ______

    Solution

    Wurtz reaction is used to make symmetrical hydrocarbons thus it cannot be used to make ethyl benzene.

  • Question 19
    1 / -0

    The general formula of a cycloalkane is

    Solution

    Cycloalkanes have general formula of CnH2n

  • Question 20
    1 / -0

    What product is obtained by heating ethylidene chloride with alcoholic KOH?

    Solution

    Dehydrohalogenation takes place. Preparation of alkyne by heating ethylene chloride with alc. KOH followed by sodamide in ammonia solution.

  • Question 21
    1 / -0

    Carbon-carbon double bond in alkenes consists of

    Solution

    sigma bond is formed by head-on overlap, pi bond is formed by lateral overlap. Alkenes contain 1 pi bond and 1 sigma bond.

  • Question 22
    1 / -0

    in Friedel-Crafts alkylation reaction, when benzene is treated with an alkyl halide in the presence of a catalyst, alkylbenene is formed. The catalyst used is

    Solution

    anhydrous alluminium chloride produces electrophile to attack benzene.

  • Question 23
    1 / -0

    Ozonolysis of an organic compound 'A' produces acetone and propionaldehyde in equimolar mixture. Identify 'A' from the following compounds 

    [AIEEE 2011]

    Solution

  • Question 24
    1 / -0

    Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E.Compound E on further treatment with aqueous KOH yields compound F.Compound F is

    Solution

  • Question 25
    1 / -0

    What product is obtained by passing ethanol vapours over heated alumina?

    Solution

    Dehydration of alcohols is done in presence of alumina at 3500−4000 and by this process alkene is obtained.

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