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 24 of 27
- A. Delocalization of negative charge in OH group
- B. Delocation of positive charge on the carbon atom in ring
- C. Delocalization of negative charge in the ring
- D. Delocalization of positive charge in the OH group
Explanation: Phenol is more acidic than alcohols due to stabilisation of phenoxide ion through resonance of negative charge in the ring.
Correct answer: Delocalization of negative charge in the ring- A. Salicylic acid
- B. Picric acid
- C. Cresol
- D. O-nitrophenol
Explanation: Option A: Salicylic acid is a phenol derivative with a hydroxyl group (-OH) attached to an aromatic ring.
Correct answer: Picric acid463. Which of the following major product(s) is formed when phenol reacts with sulphuric acid at 100 °C?
- A. Ortho-hydroxy benzene sulphonic acid
- B. Para-hydroxy benzene sulphonic acid
- C. Meta-hydroxybenzene sulphonic acid
- D. Both a and b
Explanation: The reaction of phenol with concentrated sulphuric acid is thermodynamically controlled.
Correct answer: Para-hydroxy benzene sulphonic acid- A. OH group
- B. Phenoxide ion
- C. Benzene ring
- D. All of these options are correct
Explanation: OPTION A: Phenol is an aromatic alcohol, and the presence of a hydroxyl (OH) group in the molecule makes it an electrophilic substrate.
Correct answer: OH group- A. Due to presence of resonance in phenol
- B. Due to the absence of resonance in alcohol
- C. Both Options A and B are correct
- D. Because in phenol, hydrogen is attached to oxygen
Explanation: The answer is Both Options A and B are correct. Phenol is more acidic than alcohol because of two reasons: The presence of resonance in…
Correct answer: Both Options A and B are correct- A. Alcohol
- B. Carboxylic acids
- C. Esters
- D. Amines
Explanation: Acetyl chloride, CH3COCl , which is a derivative of carboxylic acid but more reactive, will react with phenol in the presence of NaOH to…
Correct answer: Esters- A. Ethoxide ion
- B. Tertiary alkoxide ion
- C. Secondary anion
- D. Phenoxide ion
Explanation: in phenoxide ion Oxygen has delocalised-ve charge.it is highly electronegative in nature and stabilised by resonance
Correct answer: Phenoxide ion- A. Picric acid
- B. Benzene
- C. Cresol
- D. Carbolic acid
Explanation: Option B is correct as Phenol gives out a proton and forms phenoxy anion.
Correct answer: Benzene- A. Hydrogenation
- B. Reaction with formaldehyde
- C. Nitration
- D. Halogenation
Explanation: Option A is correct as Phenol is a benzene ring with an OH group bonded to one carbon, if we "hydrogenate" the ring, the carbons will use…
Correct answer: Hydrogenation- A. 4-5
- B. 3-5
- C. 2-4
- D. 5-6
Explanation: The solution of phenol in water has a pH of about 5-6 ( depending upon its concentration ).
Correct answer: 5-6- A. H2 gas
- B. CO2 gas
- C. O2
- D. None of these options are correct
Explanation: None of these options are correct. Phenols, which are aromatic compounds containing a hydroxyl group (-OH) directly attached to an…
Correct answer: None of these options are correct- A. Coke
- B. Pitch
- C. Aromatic compounds
- D. Coal tar
Explanation: Phenol was first obtained from Coal tar Phenol was initially obtained from coal tar.
Correct answer: Coal tar- A. Carbonic acid
- B. Carbolic acid
- C. Acetic acid
- D. Hydroxy acid
Explanation: Carbonic acid: H2CO3 Acetic acid: CH3COOH (ethanoic acid)Carbolic acid: C6H5OH (phenol)Hydroxy acid: a type of acid found in natural foods
Correct answer: Carbolic acid- A. Dense
- B. Hard
- C. Deliquescent
- D. Intermittent
Explanation: Phenol reacts with moisture in the air to give its smell.Phenol is colorless, crystalline solid, and also deliquescent.
Correct answer: Deliquescent- A. Picric acid
- B. Benzene
- C. Cresol
- D. Carbolic acid
Explanation: When phenol is heated with zinc it undergoes a reduction reaction and benzene is formed.
Correct answer: Benzene- A. Coke
- B. Pitch
- C. Aromatic compounds
- D. Coal tar
Explanation: Phenol was first obtained from coal tar, which is a byproduct of the coal gasification process.
Correct answer: Coal tar- A. Water
- B. Oxygen
- C. Carbon dioxide
- D. Sulfur dioxide
Explanation: Ethanol fermentation, also called alcoholic fermentation, is a biological process that converts sugars such as glucose, fructose, and…
Correct answer: Carbon dioxide- A. O - H
- B. C - O
- C. Both A and B
- D. None of these
Explanation: Which bond breaks depends on the nature of the attacking reagent. If a nucleophile attacks C-O bond will break, and if an electrophile…
Correct answer: O - H479. Methanol is prepared from carbon monoxide and hydrogen. The catalyst used for this reaction is:
- A. ZnO + CoO2
- B. ZnO + CuO
- C. ZnO + Ag2O
- D. Cr2O3 + ZnO
Explanation: A is incorrect as CoO2 is not used as a catalyst in the preparation of methanol.B is incorrect as CuO2 is not used as a catalyst in the…
Correct answer: Cr2O3 + ZnO- A. ZnCl2
- B. ThO2
- C. C6H5N
- D. Cr2O3
Explanation: A is incorrect as ZnCl2 is used as a catalyst in Lucas Test.Lucas test: a test that is Designed to Differentiate and Categorize Primary…
Correct answer: ThO2