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Alkyl Hallide and Aryl Hallide Quiz-8

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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 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

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