haloalkanes-and-haloarenes-quiz-4

Haloalkanes And Haloarenes Quiz-4

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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 S_N 1 reaction shown by alkyl halide is not correct?

•  The added nucleophile plays no kinetic role in S_N 1 reaction.
•  The S_N 1 reaction involves the inversion of configuration of the optically active substrate.
•  The S_N 1 reaction on the chiral starting material ends up with racemization of the product.
•  The more stable the carbocation intermediate the faster the S_N 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.