Haloalkane and haloarenes quiz-1

Haloalkanes and heloarenes

Quiz

 

1. Reaction of propanone with CH3-Mg-Br followed by hydrolysis gives:
   1.   Butan-2-ol
   2.   2-Methylpropanol
   3.   Propan-2-ol
   4.   2-Methyl-2-propanol
2. Chloroethane on heating with alcoholic KOH gives
   1.   Ethane (b)
      (c) (d)
   2.   Ethene
   3.   Ethyne
   4.   Ethyl alcohol
3. Phosgene is a common name for :
   1.   Phosphoryl chloride
   2.   Carbonyl chloride
   3.   Carbon dioxide & phosphine
   4.   Carbon tetrachloride
4. Which of the following possesses highest melting point ?
   
   1.   Chlorobenzene (b)
      (c) (d)
   2.   n-dichlorobenzene
   3.   o-dichlorobenzene
   4.   p-dichlorobenzene
5. KCN reacts readily to form a cyanide with :
   1.   Ethyl alcohol
   2.   Ethyl bromide
   3.   Bromobenzene
   4.   Chlorobenzene
6. Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
   1.   Benzyl Chloride
   2.   Ethyl chloride
   3.   Chlorobenzene
   4.   Isopropyl chloride
7. The increasing order of nucleophilicity would be?
   1.   Cl– < Br– < I–
   2.   I– < Cl– < Br–
   3.   Br– < Cl– < F–
   4.   I– < Br– < Cl–
8. Which of the following is most reactive towards SN1 reaction?
   1.   C6H5C(CH3)C6H5Br
   2.   C8H5CH2Br
   3.   C6H5CH(C6H5)Br
   4.   C6H5CH(CH3)Br
9. A Grignard reagent may be made by reacting magnesium with----------in presence of dry ether.
   1.   Methyl amine
   2.   Diethyl ether
   3.   Ethyl iodide
   4.   Ethyl alcohol
10. C-Cl bond of chlorobenzene in comparison to C-Cl bond in methyl chloride is
    1.   Longer and weaker
    2.   Shorter and weaker
    3.   Shorter and stronger
    4.   Longer and stronger
11. Toluene reacts with a halogen in the presence of iron (III) chloride giving ortho and para halo compounds. The reaction is
    1.   Electrophilic elimination reaction
    2.   Electrophilic substitution reaction
    3.   Free radical addition reaction
    4.   Nucleophilic substitution reaction
12. Which of the following is an example of vic-dihalide?
    
    
    1.   Dichloromethane
    2.   1,2-dichloroethane
    3.   Ethylidene chloride
    4.   Allyl chloride
13. Chlorobenzene is formed by reaction of chlorine with benzene in the presence of AlCl3. Which of the following species attacks the benzene ring in this reaction ?
    
    1.   Cl⁻
    2.   Cl⁺ (Cl+)
    3.   AlCl₃
    4.   [AlCl₄]⁻
14. Ethylidene chloride is a/an ______________.
    
    1.   vic-dihalide
    2.   gem-dihalide
    3.   allylic halide
    4.   vinylic halide
15. Boiling point of alkyl bromide is higher than alkyl chloride due to
    1.   High vander vaal's force than alkyl chloride.
       
       
       
       
       High Vander waals force in alkyl bromide than alkyl chloride.
    2.   High ionic force than alkyle chloride
    3.   more molecular mass than alkyl chloride
    4.   Both (A) and (C)
16. SN₂ reaction proceeds with__________
    1.   Complete stereochemical inversion
    2.   racemisation
    3.   Both (A) and (B)
    4.   None of these
17. Which is correct arrangement of compounds in order of reactivity towards SN₂ substitution :
    1.   2-bromo-2-methyl butane< 1-bromopentane< 2-bromopentane
    2.   1-bromopentane >2-bromopentane > 2-bromo-2-methyl butane
    3.   1-bromopentane< 2-bromopentane<2-bromo-2-methyl butane
    4.   2-bromo-2-methyl butane< 1-bromopentane< 2-bromopentane
18. Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN form isocyanides as the chief product.due to
    1.   ionic nature of KCN and AgCN
    2.   covalent nature of KCN and AgCN
    3.   ionic nature of KCN and covalent nature of AgCN
    4.   covalent nature of KCN and ionic nature AgCN
19. Which do not give silver nitrate test-
    1.   Vinyl halides only
    2.   Aryl halides only
    3.   alkyl halides only
    4.   both (A) and (B)
20. SN₁ reaction proceeds with__________
    1.   Complete stereochemical inversion
    2.   Racemisation
    3.   Both (A) and (B)
    4.   None of these