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 22 of 27
- A. CH3CO2H and HOCH2CH2CH2CO2H
- B. CH3CO2H and HO2CCH2CH2CO2H
- C. CH3CH2CO2H and HO2CCH2CO2H
- D. CH3CH2CO2H and HOCH2CH2CO2H
Explanation: The answer is C as when the double bond breaks, based on the structure of both the carbons involved in the double bond, each having a…
Correct answer: CH3CH2CO2H and HO2CCH2CO2H- A. Tertiary
- B. Secondary
- C. Quaternary
- D. Primary
Explanation: Primary carbon is that carbon atom that is bonded to only one carbon atom. Secondary carbon is bonded to two carbon atoms.
Correct answer: Primary- A. Amines
- B. Alkane
- C. Aldehyde
- D. Alkynes
Explanation: Oxidation of alcohol results in the formation of aldehydes. R-OH gets converted to R-CHO after oxidation.
Correct answer: Aldehyde- A. C2H5OH
- B. CH3OH
- C. HCHO
- D. CH3COOH
Explanation: Methanol is also referred as wood alcohol or wood spirit or wood naphtha as the earliest method for its preparation was by destructive…
Correct answer: CH3OH- A. Alkyl halides
- B. Alcohols
- C. Alkene
- D. Carboxylic acids
Explanation: Lucas test is used to differentiate and categorise primary, secondary and tertiary alcohols using a solution of anhydrous zinc chloride in…
Correct answer: Alcohols- A. Tertiary alcohols > secondary alcohol > Primary alcohol
- B. Secondary alcohol > Primary alcohol > tertiary alcohols
- C. Primary alcohol > Secondary alcohol > tertiary alcohol
- D. Tertiary alcohols > Primary alcohol > Secondary alcohol
Explanation: Option A shows the correct order of reactivityof alcohols when C-O bonds break
Correct answer: Tertiary alcohols > secondary alcohol > Primary alcohol- A. Absolute alcohol
- B. Methylated alcohol
- C. Rectified spirit
- D. Pure spirit
Explanation: Option A: Absolute alcohol, also known as anhydrous alcohol, is a form of alcohol that is completely pure and does not contain any water.
Correct answer: Rectified spirit- A. C - O bond breaks
- B. H bond breaks
- C. Increase in acidity
- D. Dehydration occurs
Explanation: Option A: When a nucleophilic reagent attacks an alcohol, the nucleophile interacts with the carbon atom in the alcohol molecule.
Correct answer: C - O bond breaks- A. Carboxylic
- B. Aldehydes
- C. Phenols and ethers
- D. Alcohols
Explanation: Carboxylic acids are organic compounds that contain a carboxyl group (-COOH) attached to a carbon atom of an alkyl or aryl group.
Correct answer: Alcohols- A. Alkanal
- B. Alkyl alcohols
- C. Alkanol
- D. Alkenol
Explanation: In IUPAC (International Union of Pure and Applied Chemistry) naming, alcohols are named as alkanols.
Correct answer: Alkanol431. Ethanol is used as ?
- A. A drink
- B. A fuel
- C. A preservative
- D. All of above
Explanation: Ethanol is used for all of the purposes mentioned: A DRINK: Ethanol is commonly used as an alcoholic beverage and is the type of alcohol…
Correct answer: All of above- A. Primary alcohols
- B. Secondary alcohols
- C. Tertiary alcohols
- D. All of these options are correct
Explanation: OPTION A: Primary alcohols have a hydrogen atom attached to the carbon atom carrying the hydroxyl group, making them more reactive and…
Correct answer: Tertiary alcohols- A. CH3OCH3
- B. CH3OH
- C. CH3COOH
- D. CH3COCH3
Explanation: Option A: is ether due to functional group ROR ( CH3-OCH3)Option B: is alcohol due to presence of hydroxyl (OH) functional group.Option…
Correct answer: CH3OH- A. Ethanol
- B. Ethene
- C. Ethylene glycol
- D. Propene
Explanation: Ethylene glycol is an alcohol-based organic compound that often serves as an antifreeze agent in vehicle and heating, ventilation, and air…
Correct answer: Ethylene glycol- A. Primary alcohol
- B. Tertiary alcohol
- C. Methyl alcohol
- D. Secondary alcohol
Explanation: Option A : Primary alcohols are not very reactive when the O-H bond breaks because the carbon atom to which the hydroxyl group is attached…
Correct answer: Methyl alcohol- A. On heating
- B. Immediately
- C. After 5-10 minutes
- D. After 20 minutes
Explanation: A tertiary alcohol reacts almost immediately with an alkyl halide to form an insoluble alkyl halide that forms an oily layer on the surface
Correct answer: Immediately- A. MgO
- B. CaO
- C. CO2
- D. Cl2
Explanation: Is correct as it is a PTB line tha states " Redistillation of rectified spirit in the presence of CaO gives absolute alcohol "
Correct answer: CaO- A. Primary alcohol
- B. Secondary alcohol
- C. Tertiary alcohol
- D. All of above
Explanation: Is correct as we know that the liquids which have prominent hydrogen bonding have higher boiling points and in primary alcohols the…
Correct answer: Primary alcohol- A. Acidified KMnO4
- B. Acidified K2Cr2O7
- C. Acidified CuCl2
- D. Pyridine
Explanation: Tertiary alcohols are resistant to oxidation .IN the presence of acidified K2CR207 they undergo elimination reaction to give alkene.
Correct answer: Acidified K2Cr2O7- A. Marsh gas
- B. Carbon dioxide and water
- C. Water gas
- D. Methane + H2
Explanation: Explanation for this question will be added soon.
Correct answer: Water gas