Haloalkanes & Haloarenes MCQ

Haloalkanes & Haloarenes

Multiple Choice Questions

  

 

1. The IUPAC name of CH3CH=CHC(Br)(CH3)2
   1.   2-Bromo-2-methylpent-3-ene
   2.   2-Methyl-2-bromopent-3-ene
   3.   4-Bromo-4-methylpent-2-ene
   4.   4-Methyl-4-bromopent-2-ene
2. The example of ambident nucleophile is
   1.   NH₃
   2.   OR^-
   3.   H₂O
   4.   CN^-
3. The major organic product of the reaction (CH3)3CBr + KOH ) ---^{(Ethanol,Heat}-->
   1.   2-Methylpropene
   2.   2-Methylpropan-2-ol
   3.   2-Methylpropan-1-ol
   4.   None of the above.
4. The product obtained by the reaction 1-Bromopropane with KCN is
   1.   Propane isonitrile
   2.   Prop-1-ene
   3.   Ethene
   4.   Propane nitrile
5. Which of the following statement is false for SN1 reaction.
   1.   It is a two-step process.
   2.   Order of kinetics is one.
   3.   Only inversion of configuration takes place.
   4.   Carbocation is formed during mechanism.
6. Which of the following statement is false for SN2 reaction.
   1.   It follows second order kinetics
   2.   The trend of reactivity of alkyl halide is tertiary > secondary > primary.
   3.   It is a one step.
   4.   Only inversion of configuration takes place.
7. Arrange 1-Bromobutane, 1-Bromo-2,2-dimethylpropane, 1-Bromo-2-methylbutane, 1-Bromo-3-methylbutane in decreasing order of reactivity towards SN2 reaction.
   1.   1-Bromo-2,2-dimethylpropane > 1-Bromo-2-methylbutane > 1-Bromo-3-methylbutane > 1-Bromobutane
   2.   1-Bromo-2-methylbutane > 1-Bromo-2,2-dimethylpropane > 1-Bromo-3-methylbutane > 1-Bromobutane
   3.   1-Bromo-2-methylbutane > 1-Bromo-3-methylbutane > 1-Bromobutane > 1-Bromo-2,2-dimethylpropane
   4.   1-Bromobutane > 1-Bromo-3-methylbutane > 1-Bromo-2-methylbutane > 1-Bromo-2,2-dimethylpropane.
8. Arrange 2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane in increasing order of reactivity towards SN1 reaction.
   1.   1-Bromopentane, 2-Bromopentane, 2-Bromo-2-methylpentane.
   2.   2-Bromopentane, 1-Bromopentane, 2-Bromo-2-methylpentane.
   3.   2-Bromo-2-methylpentane, 2-Bromopentane, 1-Bromopentane.
   4.   1-Bromopentane, 2-Bromo-2-methylpentane, 2-Bromopentane.
9. Arrange 1-Chloropropane, Isopropyl chloride, 1-Chlorobutane in order of increasing boiling points.
   1.   1-Cholorobutane < 1-Choloropropane < Isopropyl chloride.
   2.   Isopropyl chloride < 1-Choloropropane < 1-Cholorobutane.
   3.   1-Choloropropane < Isopropyl chloride < 1-Cholorobutane.
   4.   Isopropyl chloride < 1-Cholorobutane < 1-Choloropropane.
10. For a given alkyl group, the boiling points of alkyl halides follow the order:
    1.   RCl > RBr > RI
    2.   RI > RCl > RBr
    3.   RBr > RI > RCl
    4.   RI > RBr > RCl
11. Which of the following is not a chiral?
    1.   Butan-2-ol
    2.   3-Methylhexane
    3.   2,3-Dihydroxypropanoic acid
    4.   2,3-Dibromobutane
12. Butane nitrile may be prepared by heating
    1.   Propyl alcohol with KCN
    2.   Propyl chloride with KCN
    3.   Butyl chloride with KCN
    4.   Butyl chloride with AgCN
13. The reaction 2 RX + 2 Na -- ^{Dry ether} --> R-R + 2 NaX is called
    1.   Fittig reaction
    2.   Willianson’s synthesis
    3.   Wurtz reaction
    4.   Swarts reaction
14. The reactivity order of halides for dehydrohalogenation is
    1.   R-F > R-Cl > R-Br > R-I
    2.   R-I > R-Br > R-Cl > R-F
    3.   R-I > R-Cl > R-Br > R-F
    4.   R-F > R-I > R-Br > R-Cl
15. The product of reaction of alcoholic silver nitrite with ethyl bromide is
    1.   Ethylene
    2.   Ethyl alcohol
    3.   Nitro ethane
    4.   Ethyl nitrite
16. Which of the following gives only one monochloro derivatives ?
    1.   n-hexane
    2.   2,3-dimethylpentane
    3.   2-methylpentane
    4.   neo-pentane
17. In the following sequence of reactions, B is
    C6H6 ---_{Cl2, FeCl3} --> A ----_Na --> B
    
    1.   Di phenyl
    2.   Chlorobenzne
    3.   Benzyl chloride
    4.   Chlorophenylmethane
18. When neopentyl bromide is subjected to Wurtz reaction, the product formed is:
    1.   2,2,4,4-tetramethylhexane
    2.   2,2,4,4-tetramethylpentane
    3.   2,2,5,5-tetramethylhexane
    4.   2,2,3,3-tetramethylhexane
19. The compound that does not undergo hydrolysis by SN1 mechanism is
    1.   CH2=CHCH2Cl
    2.   C6H5Cl
    3.   C6H5CH2Cl
    4.   C6H5CH(CH3)Cl
20. The alkene that will give the same product with HBr in the absence as well as in the presence of peroxide is
    1.   1-butene
    2.   Propene
    3.   1-hexene
    4.   2-butene
21. Tertiary alkyl halide is practically inert to substitution by SN2 mechanism because of
    
    1.   Instability
    2.   Steric hindrance
    3.   Inductive effect
    4.   Insolubility
22. How many monochloro structural isomers are expected in free radical monochlorination of 2-methylbutane.
    1.   2
    2.   3
    3.   4
    4.   6
23. The major product obtained by the addition reaction of HBr to 4-methylpent-1-ene in the presence of peroxide is
    1.   1-bromo-4-methylpentane
    2.   4-bromo-2-methylpentane
    3.   2-bromo-4-methylpentane
    4.   3-bromo-2-methylpentane
24. Chlorobenzene can be obtained from bezene diazonium chloride by
    1.   Friedel Crafts reaction
    2.   Sandmeyer’s reaction
    3.   Wurtz reaction
    4.   Fittig reaction
25. Grignard reagents should be prepared under anhydrous condition because
    1.   Grignard reagent is soluble in water
    2.   Grignard reagents react with moisture to form hydrocarbon
    3.   Grignard reagents hydrolyse to alcohol
    4.   None of the above.