Free Alcohols and Phenols MCQs with Answers
535 Alcohols and Phenols MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Alcohols are classified as primary, secondary or tertiary and studied through their hydrogen bonding, acidity, oxidation and reactions with active metals, acids and halogenating agents. Phenols require separate treatment because the hydroxyl group is attached to an aromatic ring, making their acidity and electrophilic substitution different from ordinary alcohols.
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Read the Alcohols and Phenols notesFree MDCAT chapter notes with key terms535 questions · page 23 of 27
- A. Primary alcohol
- B. Secondary alcohol
- C. Tertiary alcohol
- D. Methanol
Explanation: Option C is correct as "tertiary alcohols" are more reactive because the increased number of alkyl groups increases the positive inductive…
Correct answer: Tertiary alcohol- A. Reaction of alkenes with X2/water
- B. Reaction of alkene with water
- C. Reaction of alkene with H2SO4/water
- D. Reaction of alkene with Ni
Explanation: Option CAlkenes react with water in the presence of concentrated sulphuric acid to form alcoholsCH2=CH2 + H2SO4 --------->…
Correct answer: Reaction of alkene with H2SO4/water- A. 10-15 degrees
- B. 25-30 degrees
- C. 25-35 degrees
- D. 25-40 degrees
Explanation: Option C is correct since 25-35 degrees is the perfect range for the process of fermentation.
Correct answer: 25-35 degrees- A. Propanol
- B. Methanol
- C. Ethanol
- D. Butanol
Explanation: Ethanol shows positive result with iodoform test. Ethanol has a hydrogen atom attached to the carbon with the -OH group.
Correct answer: Ethanol- A. Ethanol
- B. Ethene
- C. Ethylene glycol
- D. Propene
Explanation: Option A: Ethanol is not used as automobile antifreeze. Ethanol is a type of alcohol that is commonly used as a fuel additive or solvent.
Correct answer: Ethylene glycol- A. 3
- B. 2
- C. 1
- D. 0
Explanation: A tertiary carbon atom is a carbon atom bound to three other carbon atoms.
Correct answer: 0- A. Glycol and cyclohexanol
- B. Glycerol
- C. Ethylene glycol
- D. Resorcinol
Explanation: This option is correct because trihydric is the compound having three hydroxyl groups (OH). Thus glycerol has three OH groups.
Correct answer: Glycerol- A. elimination reaction
- B. oxidation reaction
- C. combustion
- D. decomposition
Explanation: This option is correct because alcohol when heated with strong acid (H₂SO H3PO4) undergoes elimination reaction to generate alkene and…
Correct answer: elimination reaction- A. 0.12
- B. 0.14
- C. 0.2
- D. 0.32
Explanation: In fermentation the ethanol obtained never exceeds more than 0.14.
Correct answer: 0.14- A. Primary alcohol > secondary alcohol > tertiary alcohol
- B. Methyl alcohol > primary alcohol > secondary alcohol > tertiary alcohol
- C. Primary alcohol < secondary alcohol < tertiary alcohol
- D. Ethanol > primary alcohol > secondary alcohol > tertiary alcohol
Explanation: This option is correct because it shows the correct order of reactivity of alcohol when O-H bond break.
Correct answer: Methyl alcohol > primary alcohol > secondary alcohol > tertiary alcohol- A. C2H5OH + CH3COOH H2SI4
- B. 2C2H5OH + 2Na ----->2CH5ONa + H2
- C. C2S5OH + HCl ZnClL2 ----->C2H5CL+ H2O
- D. Both Options A and B are correct
Explanation: Option A and B are example of electrophilic attack on alcohol.
Correct answer: Both Options A and B are correct- A. CH3-O-CH3
- B. CH3-OH
- C. CH3COOH
- D. CH3COCH3
Explanation: The functional group of alcohol is represented by R-OH, where R represents an alkyl group. Here, CH3-OH is the alcohol.
Correct answer: CH3-OH- A. Carboxylic acids
- B. Phenol
- C. Ethanol
- D. HCl
Explanation: "Ethanol" is the least acidic out of all 4 options and does not form the ethoxide ion hence the answer is C.
Correct answer: Ethanol- A. Picric acid
- B. Resorcinol
- C. Catechol
- D. P-Cresol
- E. Hydroquinone
Explanation: The explanation for this question will be added soon.
Correct answer: P-Cresol- A. Oxidation
- B. Reduction
- C. Dehydroxylation
- D. Dehydrogenation
Explanation: Benzene can be prepared from phenols too through their reduction. In this process, vapors of phenol are passed over heated zinc dust.
Correct answer: Reduction- A. Lucas test
- B. Halogenation
- C. Nitration
- D. Iodoform
Explanation: Phenols react with bromine water to give a white ppt. of 2,4,6-tribromophenol. Alcohols do not have any action with bromine water.
Correct answer: Halogenation- A. Reduction with hydrogen in the presence of Ni
- B. Reduction with zinc
- C. Reduction with alkali
- D. Reduction wilh acids
Explanation: Phenols, on heating with Zn dust yield aromatic hydrocarbons.
Correct answer: Reduction with zinc- A. Colorless crystalline solid
- B. White crystalline deliquescent solid
- C. Colorless amorphous solid
- D. Colorless amorphous deliquescent solid
Explanation: Pure phenol is a white crystalline solid, smelling of disinfectant.
Correct answer: White crystalline deliquescent solid- A. Lucas test
- B. Halogenations
- C. Nitration
- D. Idoform test
Explanation: phenol forms white precipitates when reacted with Bromine while alcohol does notP
Correct answer: Halogenations460. Phenol is known as:
- A. Carpolic acid
- B. Carbonylic acid
- C. Carbolic acid
- D. Carbolylic acid
Explanation: The other name for phenol is Carbolic acid.
Correct answer: Carbolic acid