Haloalkanes & Haloarenes II

Haloalkanes & Haloarenes II

Part I deals with RX & chloroform

Part 2 deals with ArX & Dihalides + Properties of chloroform. 

1. No precipitate is formed when chloroform reacts with …..This is because; being covalent CHCl3 can’t furnish Cl-1 ions 

A) AgNO3 

B) AgNO2 

C) Blue Litmus 

D) H2SO4 

2. CHCl3 discovered by J.V.Liebig & named by J.B.Dumes. It’s anaesthetic nature was discovered by James Young. It is not used in 

manufacture of …..directly 

A) Chloropicrin 

B) Phosgene 

C) Chloretone 

D) Salicylic Acid 

3. CCl4 + 2HF=> CF2Cl2 + 2HCl . 

The name of Freon formed is 

A) Freon -12 

B) Freon-11

C) Freon -10 

D) NOTA 

4. CH3-CHBr2 +2 KCN=>  X ; X+ H20/H+ => Y ; Y on Heating gives …..by losing ….. 

A) Propanoic acid , CO2 

B) Propanoic anhydride , H20 

C) Propanoic acid , CO2 

D) Propan-1,3-doic acid , CO2 , H2O 

5. Which of the following is not suitable method for formation of Haloarenes? 

A) From Benzene diazonium Chloride Or 

Sandmeyer’s reaction 

B) Gattermann Halogenation reaction 

C) From rxn of Benzene + HCl + ½ O2 

(commercially or Raschig Method) 

D) From reaction Phenol with NaCl 

6. Which of the statement is correct:- 

A) In Sandmeyer’s reaction Cu shuttles from +1 to +2 state & source of X is from CuX 

B) In Gattermann reaction Cu shuttles from 0 to +1 & source of X is HX. 

C) Florobenzene is prepared via Balz-Schiemann reaction 

D) Iodobenzene is prepared by reaction of BD salts with KI & warming the mixture 

E) All of the Above 

7. Identify the reaction that involves 

Isocynanide test or test for 1o

 amines 

A) Phenol + CHCl3 + Aq.KOH => Salicyaldehyde 

B) Phenol + CCl4 + Aq. KOH => Salicylic acid 

C) Ph-NH2 + CHCl3 + KOH => Ph-NC + KCl + H2O 

D) NOTA 

8. DDT is formed by reaction of ------& ----- in presence of Conc. Sulphuric acid 

A) 1,1,1-trichloroethanal & Chlorobenzene 

B) Chloropicrin & Chlorobenzene 

C) Phosgene & Chlorobenzene

 D) NOTA 

9. Perflorocarbons(PFCs) have general formula 

A) CnF2n+2 

B) CnH2n+2 

C) CnCl2n+F 

D) NOTA 

10. The pesticide DDT slowly changes to 

A) p,p’-dichlorodiphenyldichloroethene 

B) p,p’-dichlorodiphenyldichloroethane 

C) p,p’-dichlorodiphenylethene 

D) CCl3-CHO & Chlorobenzene 

11. Toluene when treated with Br2 & Fe , gives p-bromotoluene as the main product , because the methyl group 

A) Is O/P directing group & EDW 

 B) is meta-directing group 

C) Activates ring by hyperconjugation 

D) Deactivates ring by of the above 

1) A, C.  2) A,B,C     3) A,B    4) A only 

12. ArX are less reactive towards SN reactions as compared to RX due to 

A) Formation of less stable carbonium ion 

B) Resonance stabilization 

C) Longer C-X bond 

D) I-effect 

E) Sp2 Hybd. C attached to X 

1) A,B,C      2) B,D,E       3)B,E    D) D,E 

13. Which of the following is most reactive towards SN reactions 

A) 2,4,6-Trinitrochlorobenzene 

B) 2,4-Dinitrochlorobenzene 

C) P-nitrochlorobenzene 

D) m-nitrochlorobenzene 

14. The Electrophile source used in Friedal craft Acylation of Haloarenes is 

A) RCOCl 

B) (RCO)2O & RCOCl 

C) RCl 

D) All of the Above 

15. Step I- CH3CH2-OH + Cl2 => CH3CHO 

 Step II- CH3CHO + 3Cl =>CCl3-CHO 

In above reaction, the role of Cl2 in step I & II respectively is 

A) Oxid. & Chlorination

 B) Red. & chlorination 

C) Oxid. & Hydrolysis

 D) Chlorination 

16. O-Methoxybromobenzene is treated with NaNH2 & then with NH3. The product formed is 

A) O-Methoxyaniline 

B) Aniline 

C) Methoxybenzene

 D) m-methoxyaniline 

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Haloalkanes MCQs-Part I

 Haloalkanes MCQ's For NEET  Series -I 

1. In the displacement rxn. RI + MF =>  RF +MI. The rxn will be most favourable if M happens to be

 A) Li           

 B) Na          

 C) K              

D) Rb

2. The major product formed when 2Methylbut-1-ene reacts with HBr?

     A) 2-Bromo-3-methylbutane

     B) 2-Methyl-3-bromobutane

     C) 2-Bromo-2methylbutane        

     D) NOTA

3.  1,4-dimethylcyclohexane on chlorination gives ---monochorination products

  A) 1         

 B) 5           

  C) 3         

  D) NOTA

4. Which of the following is correct statement

    A) Reactivity order of Halides for dehydro-  halogenation is RI>RBr>RCl>RF

   B) Reactivity order of Halogens & alkanes  for halogenations of alkanes F2>Cl2>Br2>I2  & t>s>p respectively

   C) Reactivity order of Alcohols & HX in reaction of ROH with HX is – t>s>p & HI>HBr>HCl respectively

   D) All of the Above

5. Which of the following compound is not chiral ?

     A) CH₃CHDCH₂Cl                       

  B) 2-Butanol

    C) 2-Hydroxypropanoic acid 

   D) DCH₂CH₂CH₂Cl

6. Ethylchloride  is converted into diethylether by

A) Groove’s reaction  

   B) Tilden Reagent

C) Grignard reaction    

  D) Williamson’s synthesis

7. Consider the reactions

   I) (CH₃)₂CH-CH₂Br + C₂H₅-OH => (CH₃)₂CH-CH₂OC₂H₅     + HBr

   II) (CH₃)₂CH-CH₂Br + C₂H₅O^-  => (CH₃)₂CH-CH₂-O-C₂H₅ + Br^-

The mechanism of rxn (I) & (II) are respt.

    A) SN1 & SN2               B) SN1 & SN1

    C) SN2 & SN2               D) SN2 & SN1

8.Which one of the following is most reactive towards SN1 rxn?

    A) C₆H₅CH(C₆H₅)Br        

   B) C₆H₅CH(CH₃)Br

   C) C₆H₅C(CH₃) (C₆H₅)Br   

    D) C₆H₅CH₂Br 

9. What is IUPAC name of Westrosol( Cl₂C=CHCl) & Westron( CHCl₂-CHCl₂) respectively

A)  1,1,2-trichloroethene ; 1,1,2,2-tetrachloroethane

B) 1,1,1-trichloroethane & 1,1,1,1-tetrachloroethane

C) Tetrachloroethene & Trichloroethane

D) NOTA

10. Which of the following dipole moment order is correct ?

A) CH3Cl>CH3F>CH3Br> CH3I

B) CH3Cl>CH2Cl2>CHCl3>CCl4

C) O-dichlorobenzene(ODCB) > MDCB > PDCB

D) All of the Above

11. Which of the following statement is incorrect ?

A) RCOOAg + Br2 => RBr + CO2 + AgBr

B) Rxn A is Called Borodine-Hunsdieckar rxn

C) Rxn A operates via Free radical Mechanism

D) Rxn A  Reduces one carbon atom Number

E) Yield of RBr decreases as t>s>p

12. CH₃-CH=CH₂ reacts with I) NBS & II) HCl-H2O2 gives respt.

  A) Br-CH2-CH=CH2    & CH3-CH2-CH2Cl

  B) Br-CH2-CH=CH2    & CH3-CHCl-CH3

  C) CH3-CHBr-CH3      &    CH3-CHCl-CH3

  D) NOTA

13. CH₃-CH₂-CH₂Cl reacts with I) Alc.KOH or NaNH₂ II) Aq. KOH form ….& … respectively

   A)ROH & alkene     

  B) RX & Alcohol

   C) alkene & ROH     

  D) All are possible

14. RX reacts with I) AgNO₂  & II) NaNO₂ form --&---

   A) RNO2  & RONO    

  B) RNO2 only

  C) RONO Only           

  D) RONO & RNO2

15. Which of the following is incorrect reaction?

A)2 RX + 2Na /dryether => RR + 2NaX

B) 4EtCl + 4Na/Pb =>(Et)4Pb + 4NaCl + 3Pb

C) RX + Mg/dryether => RMgX

D) 2EtBr + Zn => Butane + ZnBr2

16. What is major Hoffmann product of reaction

CH3-CH(Br) CH2-CH3 + EtOH-KOH=>

A) CH3CH(OH)CH2-CH3

B) CH3CH2-CH2-CH3

C) CH2=CH-CH2-CH3

D) CH3-CH=CH-CH3

17. Which of the following compound do not give Haloform test Positive

A) CH3-CO-COOH            

  B) CH3-CH2-OH   

 C) CH3-CO-CHO               

  D) CH3-CO-OH

18. A yellow Product is formed when an organic compound C3H8O is warmed with aq. Na2CO3 & I2 solution. The product is

A) CHI3  

B) NaI  

C) NaIO3 

D) Adduct of NaI & C3H8O

19.Identify Z in the following series

EtI + Alc. KOH=>X   ; X + Br2=>Y ;   Y + KCN=> Z

A) EtCN     

B) EtNC    

C) NC-CH2-CH2-CN 

D) NOTA

20. The Order of SN2 reaction in RX is

A) RF>RCl>RBr>RI   

  B) RI>RBr>RCl>RF

C) RCl>RF>RBr>RI    

D) RF>RBr.>RCl>RI

21. Which of the following is correctly matched or related :-

A) COCl2- Phosgene gas          

  B) Cl3C-CHO - Chloral

C) Gammexane- 666 or BHC    

  D) DDT- C₁₄H₉Cl₅

E) Pyrene- CCl4                              

F) All of the Above

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