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Author Question: The following diol is prepared from propanal (CH3CH2CHO) and 3-bromopropanol. Which derivatives will ... (Read 21 times)

Kikoku

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on: Aug 23, 2018
The following diol is prepared from propanal (CH3CH2CHO) and 3-bromopropanol. Which derivatives will be among intermediate products in this transformation?
 
  1.a trimethylsilyl ether and a Grignard reagent
  2.an enol and a ketone
  3.a Grignard reagent and a ketone
  4.an alkoxide and an ester
  5.an organocopper reagent and an alkyne

Question 2

Phenol is treated with Fremys salt, (KSO3)2NO, followed by SnCl2/H2O. What is the product of these manipulations?
 

Question 3

Which of the following would not be a good method to prepare 2-butanone?
  1.2-butanol with Dess-Martin periodinane
  2.methyl acetate with methyl Grignard
  3.2-butyne with borane followed by basic hydrogen peroxide
  4.2-butyne with HgSO4 in H2SO4/H2O
  5.3,4-dimethylhex-3-ene with KMnO4/H+

Question 4

Which set of reagents is the best to perform the following transformation?
 
  1.1. Dess-Martin periodinane, 2. CH3MgBr, 3. POCl3/pyridine
  2.1. tosyl chloride, 2. CH3MgBr
  3.1. HBr, 2. Mgo, 3. CH3I
  4.1. NaOH, 2. CH3I
  5.1. CrO3/H3O+, 2. NaBH4, 3. CH3MgBr

Question 5

What is the major elimination product in the following reaction?
 
  1.3-methyl-3-hexene
  2.3-methyl-1-hexene
  3.3-methyl-2-hexene
  4.2-ethyl-1-pentene
  5.2-ethyl-2-pentene

Question 6

Which is the best hydride reagent to carry out the following reaction?
 
  1.NaBH4
  2.NaH
  3.BH3
  4.LiAlH4
  5.H2

Question 7

What is the product of the following reaction?
 

Question 8

What is the product of the above sequence of reactions?
 
 

Question 9

What is the correct order of acidity, starting with the least acidic, for the following phenols?
 
  1.A < B < C < D
  2.D < C < A < B
  3.C < D < B < A
  4.C < D < A < B
  5.D < C < B < A

Question 10

Chiral alcohols can be converted to chlorides by several pathways. Which is the best way to make the chloride with retention of configuration?
  1.reaction with HCl
  2.reaction with PBr3 followed by NaCl
  3.reaction with tosyl chloride, followed by hydroxide
  4.reaction with KI followed by NaCl
 


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ladyjames123

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Reply #1 on: Aug 23, 2018
Answer to Question 1

1

Answer to Question 2

4

Answer to Question 3

2

Answer to Question 4

1

Answer to Question 5

3

Answer to Question 6

1

Answer to Question 7

3

Answer to Question 8

2

Answer to Question 9

3

Answer to Question 10

2


Kikoku

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Reply #2 on: Aug 23, 2018
Both answers were spot on, thank you once again


ladyjames123

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Reply #3 on: Aug 23, 2018
Great! Please up vote :D


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