2nd Year Chemistry Alcohols, Phenols, and Ethers MCQs

You can get the 2nd Year Chemistry Alcohols, Phenols, and Ethers MCQs with answers here. The important MCQs of this chapter is given here. Alcohols, Phenols, and Ethers are classes of organic compounds. Each one has its own nomenclature, manufacture method, and reactivity. Alcohol is prepared in industries. They have two types of reactions including reactions in which C-O bond breaks and in which O-H bonds break. There are some distinctions in Primary, Secondary, and Tertiary Alcohols. Phenols are the aromatic compounds having OH group attached. They are prepared in different ways. Two types of reactions have done by Phenols i.e. due to OH-group and due to benzene ring. Ethers also have a distinct nomenclature. Ethers also have different preparation methods and reactivity. Now the complete info about this chapter is given here. Scroll down for it.

2nd Year Chemistry Alcohols, Phenols, and Ethers MCQs

KEY POINTS

 

Question#1: Alcohol produced from fermentation is not concentrated above 12 to 14% because:

• Enzyme become inactive above this concentration
• Alcohol becomes denatured
• Alcohol is oxidized to vinegar
• All of these

Question#2: Which of the following can be used for alcohol denaturing?

• Methanol
• Pyridine
• Acetone
• All of these

Question#3: Primary alcohol denaturing:

• Aldehydes
• Ketones
• Branched alkenes
• All of these

Question#4: 2-Propanol upon oxidation with acidified dichromate gives:

• Acetaldehyde
• Acetone
• 2-Methypropene
• All of these

Question#5: Tertiary alcohols with acidified dichromate gives:

• Aldehydes
• Ketones
• Alkenes
• Alkynes

Question#6: When ethanol reacts with PCI₅ then products formed are?

• C₂ H₅ CI and  H₃PO₃
• C₂ H₅ CI, POCI₃ and HCI
• C₂ H₅ CI and HCI
• C₂ H₅ CI Only

Question#7: Which of the following reacts with aqueous alkaline iodine?

• 1-propanol
• Methanol
• Ethanol
• 2-Methy1-2-propanol

Question#8: When unknown primary alcohol gives yellow precipitates of iodoform it is most likely to be?

• Methanol
• 1-propanol
• Ethanol
• 1-Butanol

Question#9: Dehydration of alcohols with cone. H₂SO₄ at 180⁰ C gives:

• Ethers
• Esters
• Alkenes
• alkyl halides

Question#10: Ethanol with conc. H₂SO₄at 140⁰ C forms diethyl  ether because:

• It involves low temperature and high concentration of ethanol for ether preparation
• It gets dehydrated
• It gets dehydrogenated
• Both A and C are correct

Question#11: When alcohols react with Na metal, the alkoxide ion thus formed is strong?

• Electrophile
• Acid
• Nucleophile
• None of these

Question#12: An organic compound X is prepared by the oxidation of ethanol. This X reacts with ethanol to produce an ester what is X like to be?

• Methanoic acid
• Propanoic acid
• Ethanoic acid
• Butanoic acid

Question#13: Which of the following is used as a catalyst for esterification?

• Dil.H₂ SO₄
• Dilute alkali
• Conc. H₂ SO₄
• Cone.alkali
• Answer

  Answer

  Dil.H₂ SO₄

Question#14: Phenol reacts with aqueous bromine and decolorizes aqueous bromine forming the white precipitates of:

• 2, 4-Dibromophenol
• 2-Bromophenol
• 2, 4, 6- Tribromophenol
• 3- Bromophenol

Question#15: Picric acid can be prepared from phenol by:

• Halogenation
• Nitration
• Oxidation
• Sulphonation

Question#16: In which process alcohol is produced?

• Esterification
• Dehyrohalogenation of vicinal dihalide
• Fermentation
• Condensation of two acetone molecules in the presence of a base

Question#17: Neopentyl alcohol is a type of alcohol:

• Primary alcohol
• Secondary alcohol
• Tertiary alcohol
• Aromatic alcohol

Question#18: Absolute alcohol does not be obtained by distillation process because:

• It forms a constant boiling mixture
• Alcohol remains soluble in water
• Alcohol molecules are solvated
• Due to all the above reasons

Question#19: Tertiary butyl alcohol does not  undergo dehydrogenation because:

• It does not contain α-hydrogen
• It contains only one –OH group
• It contains electron-donating groups
• Stearic hindrance of alkyl groups

Question#20: In esterification reaction, Which one of the following bounds of alcohol undergo cleavage?

• C-H
• O-H
• C-O
• C-C

Question#21: Alcohol in which hydroxyl is attached to a carbon which is further attached to two alkyl groups is:

•  Primary alcohol
• Secondary alcohol
• Tertiary alcohol
• None of these

Question#22: Fermentation is a process involving the conversion of:

• Hydrocarbon to ethanol with the evolution of CO₂
• Hydrocarbon to ethanol with the evolution of CO
• Carbohydrate to ethanol with the evolution of CO₂
• Carbohydrate to ethanol with the evolution of CO

Question#23: What is the correct order for the acidity of water, phenol, and ethanol?

• C₆ H₅ OH>H₂ O> C₂ H₅ OH
• C₆ H₅ OH> C₂ H₅ OH> H₂O
• H₂O> C₂ H₅ OH> C₆ H₅ OH
• H₂O> C₆ H₅ OH> C₂ H₅ OH

Question#24: Which one can be used as a test for phenol?

• C₆ H₅ OH+CH₃COCI in the presence of aq. NaOH
• C₆ H₅ OH+HCHO in the presence of NaOH
• C₆ H₅ O Na +CH₃ CH₂ Br
• C₆ H₅ OH+ Br₂(excess)

Question#25: Reaction of phenol with bromine in non-polar solvent gives:

• 2, 4, 6-Tribromophenol
• p-Bromophenol
• o-Bromophenol
• A mixture of o-Bromophenol and p-Bromophenol

Question#26: Which inorganic reagent may be used to distinguish between phenol and methanol?

• Alkaline aqueous1₂
• Aqueous NaHCO₃
• K₂Cr₂ O₇ in dil.H₂SO₄
• Na metal

Question#27: Phenol on treatment with dil.HNO₃ at low temperature gives:

• o-Nitrophenol
• p-Nitrophenol
• m-Nitrophenol
• A mixture of o-Nitrophenol and p-Nitrophenol

Question#28: Alcohol in which  -OH group is attached to a carbon which is further attached to only one alkyl group is:

• Primary alcohol
• Secondary alcohol
• Tertiary alcohol
• None of these

Question#29: The statement which explains the acidic behavior of phenol:

• Its phenoxide ion become stable due to resonance
• Phenol on treatment with Na metal produces H₂ gas
• Its aqueous solution has a pH around 5 or 6
• All of these
• Answer

  Answer

  All of these

Question#30: Excess alcohol at low temperature in the presence of cone.of H₂SO₄ produce:

• Ether
• Ester
• Organic acid
• Alkene