Alkyl-Hallide-and-Aryl-Hallide-Quiz-9

Alkyl Hallide and Aryl Hallide Quiz-9

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Q1. When tetrahydrafuran is treated with excess HI, the product formed is

•  1, 4-diiodobutane
•  1, 4-butanediol
•  2-iodotetrahydrofuran
•  4-iodo-1-butanol

Solution
Tetrahydrofuran when treated with excess HI, give 1, 4-diiodobutane.

Q2.1,2-dibromoethane is added to prevent deposition of lead metal in :

•  Water pipes
•  Petrol engines
•  Electric heaters
•  Metal working lathe machines

Solution
The lead deposited is exhaused out in the form of .

Q3.  Chloral is:

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•  

Solution
Chloral is commercial name of .

Q4. Most readily hydrolysed halides is:

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Solution
Tertiary carbonium is most stable.

Q5.On treating a mixture of two alkyl halides with sodium metal in dry ether, 2-methyl propane was

obtained. The alkyl halides are

•  2-chloropropane and chloromethane
•  2-chloropropane and chloroethane
•  Chloromethane and chloroethane
•  Chloromethane and 1-chloropropane

Solution
This is Wurtz reaction. 2-chloropropane and chloromethane reacts in presence of dry ether t form 2-methyl propane. 

Q6. The following compound on hydrolysis in aqueous acetone will give

•  Mixture of (K) and (L)
•  Mixture of (K) and (M)
• Only (M)
•  Only (K)

Solution

The product (K) is formed through simple substitution while major product (L) is formed through H shift  reaction and methoxy group stabilizes the carbocation intermediate of product (L).

Q7.Wurtz’s reaction involves the reduction of alkyl halide with

•  Zn/HCl
•  HI
•  Zn/Cu couple
•  Na in ether

Solution
Wurtz’s reaction involves the reduction of alkyl halide with Na in ether.

Q8.In the preparation of chlorobenzene from aniline, the most suitable reagent is

•  Chlorine in the presence of ultraviolet light
•  Chlorine in the presence of 
•  Nitrous acid followed by heating with 
•  HCl and 

Solution

Q9.The molecular formula of the chlorinated acetone formed in the distillation of acetone with

bleaching powder is:

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Solution

Q10. Which one of the following is not true for the hydrolysis of t-butyl bromide with aqueous NaOH?

•  Reaction occurs through the  mechanism.
•  The intermediate formed is a carbocation.
•  Rate of the reaction doubles when the concentration of alkali is doubled.
•  Rate of the reaction doubles when the concentration of t-butyl bromide is doubled.

Solution
The reaction between tert-butyl bromide and hydroxide ion yields tert-butyl alcohol and follows the first order kinetics. The rate of reaction depends upon the concentration of only one reactant, which is tertiary butyl bromide.