Quiz  /  Haloalkanes and Haloarenes Class 12 MCQ Questions With Answers

  • 1. 
    Complete the following reaction R-X + KNO2 → A + KXA is

  • RNO2
  • RONO
  • RNO
  • RNO3

  • 2. 
    The IUPAC name of CH3 CH2 CH2 CH2 Br is

  • Bromobutane
  • Bromopropane
  • Bromoethane
  • Bromopentane

  • 3. 
    CH3CHCl2 and CH2Cl CH2Cl are examples of :

  • Functional isomers
  • Metamers
  • Chain isomers
  • Position isomers

  • 4. 
    The synthesis of alkyl fluoride is best accomplished by:

  • Finkelstein reaction
  • Swarts reaction
  • Free radical fluorination
  • Sandmeyer’s reaction

  • 5. 
    The typical reaction of alkyl halide is:

  • Electrophillic substitution
  • Nucleophillic substitution
  • Electrophillic addition
  • Nucleophillic addition

  • 6. 
    The reactivity of halides in SN2 reaction is

  • 3o>2o>1o
  • 2o>1o>3o
  • 1o>3o>2o
  • 1o>2o>3o

  • 7. 
    Assertion (A): Phosphorus chlorides (tri and penta) are preferred over thionyl chloride for the preparation of alkyl chlorides from alcohols.Reason (R): Phosphorus chlorides give pure alkyl halides.

  • Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
  • Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • Assertion is correct but Reason is wrong.
  • Assertion and Reason both are wrong statements

  • 8. 
    Choose the correct IUPAC name for the compound

  • 2-chloro-2-methylpropane
  • 1-chloropropane
  • 2-chloro-2-methylbutane
  • 2-chlorobutane

  • 9. 
    The most reactive alkyl halide is :

  • R – Cl
  • R – Br
  • R- I
  • R- F

  • 10. 
    Assertion (A): It is difficult to replace chlorine by -OH in chlorobenzene in comparison to that in chloroethane.Reason (R): Chlorine-carbon (C – Cl) bond in chlorobenzene has a partial double bond character due to resonance.

  • Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
  • Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • Assertion is correct but Reason is wrong.
  • Assertion is wrong but Reason is correct.

  • 11. 
    The position of –Br in the compound in CH3CH=CHC(Br)(CH3)2 can be classified as ____________.

  • Allyl
  • Aryl
  • Vinyl
  • Secondary

  • 12. 
    Compound C easily undergoes hydrolysis to form compound D, which forms 2-methylpropene when heated with concentrated sulphuric acid. Using the information above, proposed the structural formula for compound C

  • CH3CH2CH(Br)CH3
  • CH3CH2CH2CH(Br)CH3
  • CH3CH2(CH3)CH2Br
  • (CH3)2C(Br)CH3

  • 13. 
    Arrange the strength of van der Waals forces with same number of C atom (increasing):

  • RF < RCl < RBr < RI
  • RF > RCl > RBr > RI

  • 14. 
    Which of the following compounds is the rate of alkaline hydrolysis that is independent of the concentration of the hydroxide ion?

  • CH3CH2CH2CH2Cl
  • CH3CH(Br)CH3
  • C6H5CH2CH2I
  • (CH3)3CBr

  • 15. 
    Which of the following is an example of vic-dihalide?

  • Dichloromethane
  • 1,2-dichloroethane
  • Ethylidene chloride
  • Allyl chloride

  • 16. 
    Assertion: Electron withdrawing groups in aryl halides increases the reactivity towards nucleophilic substitution.Reason: 2, 4-Dinitrochlorobenzene is more reactive than chlorobenzene.

  • Both assertion and reason are true and the reason is the correct explanation of the assertion.
  • Both assertion and reason are true but reason is not the correct explanation of the assertion
  • Assertion is true but reason is false
  • Assertion is false but reason is true.

  • 17. 
    Alkyl halide on treatment with aqueous KOH give

  • Acids
  • Alcohols
  • Aldehydes
  • Alkanes

  • 18. 
    For a given halogen atom the reactivity is maximum for

  • Methyl halide
  • Primary halide
  • Secondary halide
  • Tertiary halide

  • 19. 
    Complete the following reaction R-OH + PCl5 →\rightarrow→ RCl + X + HCl X is

  • PCl3
  • PCl5
  • POCl3
  • POBr3

  • 20. 
    In SN1 type of mechanism the intermediate species is:

  • A free radical
  • A carbonium ion(carbo cation)
  • A carboanion
  • None of these

  • 21. 
    Ambident nucleophile is

  • CN
  • H2O
  • Cl
  • NH2

  • 22. 
    Assertion (A): Hydrolysis of (-)-2-bromooctane proceeds with inversion of configuration.Reason (R): This reaction proceeds through the formation of a carbocation.

  • Assertion and Reason both are correct and Reason is the correct explanation of Assertion.
  • Assertion and Reason both are correct statements but Reason is not the correct explanation of Assertion.
  • Assertion is correct but Reason is wrong.
  • Assertion is wrong but Reason is correct.

  • 23. 
    Among dihaloarenes, the melting point is highest for

  • o-Isomer
  • p-Isomer
  • m-Isomer
  • Same for all

  • 24. 
    Haloalkane is a polar molecule that undergoes nucleophilic substitution through SN1 and SN2. Arrange the following haloalkanes in order of increasing rate of unimolecular nucleophilic substitution reaction:I. 2-chloro-2-methylpropaneII. 2-chlorobutaneIII. 1-chlorobutane

  • I< II < III
  • I< III < II
  • III< I < II
  • III< II < I

  • 25. 
    In a molecule of tertiary haloalkanes, carbon atom is bonded to

  • 3 carbon atoms
  • 2 carbon atoms
  • 4 carbon atoms
  • 1 carbon atom

  • 26. 
    Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is

  • Electrophilic elimination reaction
  • Electrophilic substitution reaction
  • Free radical addition reaction
  • Nucleophilic substitution reaction

  • 27. 
    Which of the following alkyl halide is most readily undergoes hydrolysis by SN1 mechanism?

  • CH3CH2CH2Cl
  • CH3Cl
  • (CH3)2 CHCl
  • (CH3)3 CCl
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