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Haloalkanes And Haloarenes Quiz-4

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The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..



Q1. A yellow precipitate is obtained when aqueous AgNO3 is added to a solution of the compound:
  •  CCl3 CHO
  •  CHI3
  •  CHCl3
  •  C6 H5 CH2 Cl
Solution
(b) Due to less stable nature of CHI3.  

Q2.What happens if CCl4 is treated with AgNO3?
  •  A white ppt. of AgCl will form
  •  NO2 will be evolved
  •  CCl4 will dissolve in AgNO3
  •  Nothing will happen
Solution
(d) CCl4 is a covalent compound, therefore, it does not ionise to give Cl- ions hence, it does not give white ppt. of AgCl when treated with AgNO3 soution. There is no reaction to evolve NO2 .CCl4 will form a separate layer as it is immiscible with water.

Q3. Which of the following compounds undergo E2 reactions more easily? 
  •  
  •  CH3 (CH2 )2 CH2 Cl
  •  CH3 (CH2 )2 CH2 I
  •  
Solution
(d) C—I bond is broken easily as well as ease of reaction is t-alkyl halide > s-alkyl halide > p-alkyl halide.

Q4. Number of monochloro derivatives obtained when neo-pentane is chlorinated, is
  •  One
  •  Two
  •  Three
  •  Four
Solution



Q5.
  •  Ethylene chloride
  •  Acetic acid
  •  Propionic acid
  •  Ethyl cyanide
Solution
  (c) C2 H5 CN(A) on hydrolysis gives C2 H5 COOH.  

Q6. 1, 2-dibromoethane reacts with alcoholic KOH to yield a product X. The hybridisation state of the carbons present in X respectively, are
  •  sp,sp
  •  sp3,sp3
  •  sp2,sp2
  •  sp3,sp2
Solution
 

Q7.The reagent used in the conversion of 1-butanol to 1-bromobutane is:
  •  CHBr3
  •  Br2
  •  CH3 Br
  •  P+Br2
Solution

Q8.Which of the following statements regarding the SN 1 reaction shown by alkyl halide is not correct?
  •  The added nucleophile plays no kinetic role in SN 1 reaction.
  •  The SN 1 reaction involves the inversion of configuration of the optically active substrate.
  •  The SN 1 reaction on the chiral starting material ends up with racemization of the product.
  •  The more stable the carbocation intermediate the faster the SN 1 reaction.
Solution
 

Q9.The products of reaction of alcoholic silver nitrite with ethyl bromide are:
  •  Ethane
  •  Ethene
  •  Ethyl alcohol
  •  Nitroethane
Solution
(d) Nitroethane

Q10. The reactivities of methyl chloride (A ) propyl chloride (B ) and chlorobenzene (C ) are in the order :
  •  A>B>C
  •  C>B>A
  •  A>C>B
  •  B>A>C
Solution
(a) Among the primary halides reactivity order is CH3 X>C2 H5 X>C3 H7 X , also chlorobenzene is less reactive due to resonance.


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