Free Alcohols MCQs with Answers
154 Alcohols 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 contain a hydroxyl group attached to a saturated carbon atom and are classified as primary, secondary or tertiary. Their nomenclature, hydrogen bonding, acidity, oxidation, dehydration, reaction with sodium and conversion to haloalkanes are covered, along with the distinction between alcohols and phenols, where the hydroxyl group is attached directly to an aromatic ring.
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154 questions · page 5 of 8
- 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: Alkanol- 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- 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