Alkyl-Hallide-and-Aryl-Hallide-Quiz-8

Alkyl Hallide and Aryl Hallide Quiz-8

Dear Readers,

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Q1. A Grignard reagent is prepared by reacting magnesium with:

•  Methyl amine
•  Diethyl ether
•  Ethyl iodide
•  Ethyl alcohol

Solution

Q2.1-chlorobutane on reaction with alcoholic potash gives

•  but-1-ene
•  butan-1-ol
•  but-2-ene
•  butan-2-ol

Solution

Q3.  Which of the following does not answer iodoform test?

•  n-butyl alcohol
•  Acetophenone
•  Acetaldehyde
•  Ethylmethyl ketone

Solution
Iodoform test is given by the compounds containing either − roup or  group. The structures of the given compounds are as ∴ n-butyl alcohol does not give iodoform test

Q4. Reaction of alkyl halides with aromatic compounds in presence of anhy. is known as

•  Friedel-Craft’s reaction
•  Hofmann degradation
•  Kolbe’s synthesis
•  Beckmann rearrangement

Solution
Friedel-Craft reaction : In this reaction alkyl halides react with aromatic compounds in presence of 

AlCl or FeCl to form alkyl substituted aromatic compounds.

Q5.Bottles containing lost their original labels. They were labelled A and B

for testing.A and B were separately taken in a test tube and boiled with NaOH solution. The end

solution in each tube was made acidic with dilute and then some   solution was

added. Substance B gave a yellow precipitate. Which one of the following statements is true for this

experiment?

•  A was
•  A was
•  B was
•  Addition of HNO was unnecessary

Solution
 A was

Q6. Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is

•  2-methylpentane
•  2,2-dimethylbutane
• 2, 3-dimethylbutane
•  n-hexane

Solution

Q7.Tertiary butyl alcohol gives tertiary butyl chloride on treatment with

•  
•  KCN
•  NaOCl
•  

Solution
Tertiary alcohols readily react with Lucas reagent  to give white turbidity due to the formation of halide. 

Q8.1, 2-dibromo cyclohexane on dehydrogenation gives

•  
•  
•  
•  None of these

Solution

Q9.Which of the following will not form a yellow precipitate on heating with an alkaline solution of

iodine?

•  
•  
•  
•  

Solution
An organic compound forms yellow precipitate of iodoform with I in presence of alkali, if it has − group directly or it has 

Q10. 1-chlorobutane on reaction with alcoholic KOH gives:

•  1-butene
•  1-butanol
•  2-butene
•  2-butanol

Solution
1-butene