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Haloalkanes and Haloarenes Test - 5

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Haloalkanes and Haloarenes Test - 5
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  • Question 1
    1 / -0

    Upon oxidation, one of the following halogen-containing compounds forms an extremely poisonous gas – – + O2  → 2 COCl2 + 2HCl

    Solution

    CHCl3 on reaction with oxygen forms phosgene. Chloroform decomposes when it exposed to sunlight.it decomposes to a harmful gas phosgene(COCl2) Chloroform decomposes when it exposed to sunlight.it decomposes to a harmful gas phosgene(COCl2)

  • Question 2
    1 / -0

    Hydrocarbons having double the number of carbon atoms than present in the original alkyl halide are produced by using

    Solution

    The Wurtz reaction, named after Charles-AdolpheWurtz, is a coupling reaction in organic chemistry, organometallic chemistry and recently inorganic main group polymers, whereby two alkyl halides arereacted with sodium metal in dry ethereal solution to form a higher alkane: 


  • Question 3
    1 / -0
    Which of the following has the highest melting point?
  • Question 4
    1 / -0

    Upon oxidation, one of the following halogen-containing compounds forms an extremely poisonous gas – – + O2  → 2 COCl2 + 2HCl

    Solution

    CHCl3 on reaction with oxygen forms phosgene. Chloroform decomposes when it exposed to sunlight.it decomposes to a harmful gas phosgene(COCl2) Chloroform decomposes when it exposed to sunlight.it decomposes to a harmful gas phosgene(COCl2)

  • Question 5
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Compound 'A' has molecular formula C5H10Cl2. It, on hydrolysis, gives C5H10O, which reacts with NH2OH to form iodoform, but does not give Fehling test. 'A' is
  • Question 6
    1 / -0

    Carbon – halogen bond of alkyl halides is responsible for their nucleophilic substitution, elimination and their reaction with metal atoms to form organometallic compounds because of its

    Solution

    Since halogen atoms are more electronegative than carbon, the carbon-halogen bond of alkyl halide is polarised; the carbon atom bears a partial positive charge whereas the halogen atom bears a partial negative charge. This is responsible for nucleophilic substitution reactions, elimination reactions and reaction of alkyl hlides with a metal to form organometallic compounds.

  • Question 7
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    The molecular formula of chloropicrin is
  • Question 8
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Which of the following compounds contains most electronegative chlorine atom?
  • Question 9
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    C - Cl bond is stronger than C - I bond because 
  • Question 10
    1 / -0
    Which of the following statements is incorrect for freons?
  • Question 11
    1 / -0
    An alkyl bromide produces a single alkene when it reacts with sodium ethoxide and ethanol. This alkene undergoes hydrogenation and produces 2-methylbutane. Identity the alkyl bromide? 
  • Question 12
    1 / -0
    Directions: The question consists of two statements: Assertion and Reason. While answering the question, you are required to choose any one of the following four responses.

    Assertion: Benzyl bromide, when kept in acetone water, produces benzyl alcohol.
    Reason: The reaction follows  mechanism. 
  • Question 13
    1 / -0
    What is the end product of the reaction of propene with N-bromosuccinimide?
  • Question 14
    1 / -0
    Directions: The question consists of two statements: Assertion and Reason. While answering the question, you are required to choose any one of the following four responses.

    Assertion: o-Dichlorobenzene is more soluble in organic solvents than the corresponding p-isomer.
    Reason: o-Dichlorobenzene is polar, while p-dichlorobenzene is not.
  • Question 15
    1 / -0
    Directions: The following question has four choices, out of which ONLY ONE is correct.

    Consider the following reaction between alkyl halides, RX and alcoholic AgNO3:
    RX + Ag R+ + Ag+ X–
    Which of the following statements is true about the above reaction?
  • Question 16
    1 / -0
    The production of CH3CH=CHCH2Br on treatment of 1–butene with N–bromosuccinimide is an example of 
  • Question 17
    1 / -0
    An organic compound A (C4H9Cl), on reaction with Na/diethyl ether, gives a hydrocarbon, which on monochlorination gives only one chloro derivative. Here, A is 
  • Question 18
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    Bottles containing C6H5I and C6H5CH2I lost their original labels. They were labelled A and B for testing. A and B were separately taken in a test tube and boiled with NaOH solution. The end solution in each tube was made acidic with dilute HNO3 and then some AgNO3 solution was added. Substance B gave a yellow precipitate. Which of the following statements is true for this experiment?
  • Question 19
    1 / -0
    When chlorobenzene is heated with chloral in the presence of small amount of concentrated H2SO4, the product obtained is
  • Question 20
    1 / -0

    Hydrocarbons are prepared from Grignard reagent by

    Solution

    Grignard reagents are highly reactive and react with any source of proton to give hydrocarbons. Even water, alcohols, amines are sufficiently acidic to convert them to corresponding hydrocarbons. Thus grignard reagent abstracts acidic hydrogen from H2O forming alkane.

     RMgX+H2O→RH+Mg(OH)X

  • Question 21
    1 / -0
    Best method for preparing alkyl chloride is
  • Question 22
    1 / -0
    Wurtz reaction involves the reduction of alkyl halide with
  • Question 23
    1 / -0
    Directions: The following question has four choices out of which ONLY ONE is correct.

    The following reaction is known as

  • Question 24
    1 / -0
    Ethyl bromide is industrially prepared from
  • Question 25
    1 / -0
    Identify the given structure:

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