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Alcohol Phenol and Ether Quiz-3

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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. Phenyl magnesium bromide reacts with methanol to give a mixture of:
  •  Anisole and Mg(OH)Br
  •  Benzene and Mg(OMe)Br
  •  Toluene and Mg(OH)Br
  •  Phenol and Mg(Me)Br
Solution


Q2.An organic compound ‘X ’ with molecular formula,is insoluble in aqueousbut dissolves in NaOH. When treated with bromine water ‘X ’ rapidly gives ‘Y ’. The compounds ‘X ’ and ‘Y ’ respectively, are
  •  Benzyl alcohol and 2, 4, 6-tribromo-3-methoxy benzene
  •   Benzyl alcohol and 2, 4, 6-tribromo-3-methyl phenol
  •  o-cresol and 3, 4, 5-tribromo-2-methyl phenol
  •  Methoxybenzene and 2, 4, 6-tribromo-3-methoxy benzene
Solution
Compound ‘X ’ () is insoluble in aqueousbut soluble in NaOH, so it is a phenol.Since, the number of carbon atoms remains the same after bromination, the compound must be meta cresol and reactions takes place as follows

Q3.  The explosive nitroglycerine is:
  •   A soap
  •  A salt
  •  An ester
  •  A complex compound
Solution
It is better to call nitroglycerine as glycerol trinitrate an inorganic ester ofand glycerol.

Q4. Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?
  •  Methane
  •  Ethane
  •  Carbon dioxide
  •  Propane
Solution
Ethyl alcohol reacts with methyl magnesium iodide as follows


Q5.Oxidation of allyl alcohol, () gives a mixture of oxalic acid and formic acid.
If this oxidation is done in presence of bromine. One would expect only:
  •  Oxalic acid
  •  Formic acid
  •  Succinic acid
  •  Acrylic acid
Solution
 Only CHOH group is oxidized to —COOH; Double bond is not affected.

Q6. A simple method to remove peroxides from ethes is to treat them with an aqueous solution of
  •  KI
  •  KCNS
  •  
  •  
Solution
Ether peroxide oxidises KI intoand itself gets reduced to ether. Therefore, KI is added to remove peroxides from ethers. 


Q7.An organic compound A containing C, H and O has a pleasant odour with boiling point of 78℃.
On boiling A with concentrated, a colourless gas is produced which decolourises bromine
water and alkaline. The organic liquid A is
  •  
  •  
  •  
  •  
Solution
The organic liquid A is  Ethyl alcohol is a colourless liquid with a characteristic pleasant smell, having boiling point 78.1℃.
(which decolouriseswater and alk.)

Q8.For which pair iodoform test cannot be used as distinction test?
  •  Propanol-1 and propanol-2
  •  Butanol-2 and 2-methyl propan-2-ol
  •  Butanol-1 and butanol-2
  •  Pentanol-1 and pentanol-3
Solution
The molecule should contain
 Unit attached to C or H in it to shown iodoform reaction.

Q9. 
A and B are
  •  
  •  
  •  
  •  
Solution


Q10. 
  •  
  •  
  •  
  • None of these
Solution

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