Alkyl-Hallide-and-Aryl-Hallide-Quiz-4

Alkyl Hallide and Aryl Hallide Quiz-4

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Q1. A yellow precipitate is obtained when aqueous is added to a solution of the compound:

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•  
•  
•  

Solution
Due to less stable nature of 

Q2.What happens if  is treated with ?

•  A white ppt. of AgCl will form
•   will be evolved
•   will dissolve in 
•  Nothing will happen

Solution
 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  soution. There is no reaction to evolve  . will form a separate layer as it is immiscible with water.

Q3.  Which of the following compounds undergo reactions more easily?

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•  
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Solution
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
The number of monochloro derivatives of a compound depends upon the type of hydrogen present in the compound. The structure of neo-pentane is

 ∵It contains only one type of hydrogens. 

∴ It will give only ony monochloro derivative

Q5.

The compound (B) in above reaction is:

•  Ethylene chloride
•  Acetic acid
•  Propionic acid
•  Ethyl cyanide

Solution
 (A) on hydrolysis gives .

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
•  
•  
•  

Solution
Alkyl halides give elimination reaction with alcoholic KOH and yield an alkene or alkyne (from dihalides) . e.g, Hence, product has both -hybridised carbon. 

Q7.The reagent used in the conversion of 1-butanol to 1-bromobutane is:

•  
•  
•  
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Solution

Q8.Which of the following statements regarding the reaction shown by alkyl halide is not

correct?

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

Solution
Statement (b) is not correct regarding the  reaction for alkyl halide because in  reaction no inversion takes place. The removal of X and the attachment of  will take place from the same side. 

Q9.The products of reaction of alcoholic silver nitrite with ethyl bromide are:

•  Ethane
•  Ethene
•  Ethyl alcohol
•  Nitroethane

Solution
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
Among the primary halides reactivity order is  , also chlorobenzene is less reactive due to resonance.