Haloalkanes And Haloarenes Test

Haloalkanes And Haloarenes

This is haloalkanes and haloarenes Test-02 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Upon oxidation, one of the following halogen containing compounds forms an extremely poisonous gas – – – + $O_2$ $\xrightarrow{{}}$2 $COCl_2$ + 2HCl
  • A
    DDT
  • B
    Dichloromethane
  • C
    Chloroform
    Correct
  • D
    Carbontetrachloride
2
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 their
  • A
    kinetic properties
  • B
    Chirality
  • C
    polarity
    Correct
  • D
    racemisation
3
Which one of the following is not a chiral molecule?
  • A
    propan – 2 – ol
    Correct
  • B
    bromochloro – iodomethane
  • C
    2 – chlorobutane
  • D
    Butan – 2 – ol
4
A mixture containing two enantiomers in equal proportions
  • A
    All the below
    Correct
  • B
    will be optically inactive
  • C
    will have zero optical rotation
  • D
    will be called a racemic mixture
5
In the reaction Pent – 2 – ene. 2 – Bromopentane. Pent – 1 – ene 2 – Bromopentane on heating with alcoholic KOH, forms two compounds: Pent – 1 – ene and Pent – 2 – ene. Which one of the following statements is true
Question 5 figure 1
  • A
    Pent – 2 – ene is formed as a major product
    Correct
  • B
    Sometimes Pent1 – ene is the major product and other times Pent – 2 – ene
  • C
    Both in equal proportion
  • D
    Pent – 1 – ene is formed as a major product
6
In the reaction Pent – 2 – ene. 2 – Bromopentane. Pent – 1 – ene, 2 – Bromopentane on heating with alcoholic KOH, forms two compounds: Pent – 1 – ene and Pent – 2 – ene., if one major and one product are formed , then
Question 6 figure 1
  • A
    the major product is formed which has the greater number of alkyl groups attached to the c=c
  • B
    all of these
    Correct
  • C
    formation of more than one alkenes due to the availability of more than one α – hydrogen atoms.
  • D
    B is called Zaitsev (also pronounced as Saytzeff) rule
7
The dipole moment of chlorobenzene is lower than that of cyclohexyl chloridechlorobenzenecyclohexyl chloride
Question 7 figure 1
  • A
    Cl atom is linked to $sp^2$ hybridized carbon atom in chlorobenzene
    Correct
  • B
    Cl atom is more electronegative in cyclohexyl chloride
  • C
    Cl atom is linked to $sp^2$ hybridized carbon atom in cyclohexyl chloride
  • D
    Cl atom is more electropositive in chlorobenzene
8
Alkyl halides are insoluble in water
  • A
    weak hydrogen bonds exist between water molecules
  • B
    high energy is released when newattractions are set up between the haloalkane and the water molecules
  • C
    the force of attraction between the alkyl halide and water is weaker and cannot overcome the force of attraction between alkyl halide and alkyl halide as also that of water and water molecules
    Correct
  • D
    alkyl halides are non polar compounds
9
Hydrocarbons are prepared from Grignard reagent by
  • A
    by exposing them to diethyl ether
  • B
    None of the above
  • C
    by exposing them to Magnesium
  • D
    by reacting them to water
    Correct
10
Grignard reagent should be prepared under anhydrous conditions because
  • A
    All the below
    Correct
  • B
    They are highly reactive
  • C
    the Mg – halogen bond is ionic
  • D
    the carbon – Mg bond is covalent but polar
11
The following compound is ,as per the IUPAC system
Question 11 figure 1
  • A
    2,2,3 – triethyl pent – 4 – ene
  • B
    None of the above
  • C
    2diethyl, 3 – ethyl pentene
  • D
    3,4,4 – triethyl pent – 2 – ene
    Correct
12
Name the following aryl halide as per the IUPAC system
Question 12 figure 1
  • A
    4 – chloro – 4 – (2 – methyl propyl) benzene
  • B
    1 – chlorobenzyl – 2 – methyl propane
  • C
    None of the above
  • D
    1 – chloro – 4 – (2 – methyl propyl) benzene
    Correct
13
Isomers of the compound$C_4H_9Br$ are
  • A
    1 – Bromobutane and 2 – Bromobutane
  • B
    1 – bromo 2 – methyl propane and 2 – bromo2 – methyl propane
  • C
    B and C
    Correct
  • D
    None of the above
14
Hydrocarbons having double the number of carbon atoms than present in the original alkyl halide are produced by using
  • A
    Fittig reaction
  • B
    Sandmeyer’ reaction
  • C
    Wurtz reaction
    Correct
  • D
    Williamson’s synthesis
15
For alkanes containing odd number of carbon atoms, Wurtz reaction is not preferred. Because
  • A
    a mixture of four alkyl halide has to be used
  • B
    a mixture of three alkyl halide has to be used
  • C
    None of the above
  • D
    a mixture of two alkyl halide has to be used
    Correct