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 4 of 8
- A. Aldehydes & Ketones
- B. Alcohols and Phenols
- C. Phenols and Ethers
- D. Carboxylic acids
Explanation: Alcohols, phenols, and ethers are much closer to water in structure and hence are considered as derivatives of water.
Correct answer: Alcohols and Phenols- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The explanation for this question will be added soon!
Correct answer: Option B- A. Fermentation
- B. Cracking
- C. Polymerization
- D. Reforming
Explanation: The explanation for this question will be added soon!
Correct answer: Fermentation- A. lodoethane, ethene, bromocthane
- B. Ethene, lodoethane, ethanol
- C. Ethene, ethanol, lodoethane
- D. Ethanol, iodocthane, ethane
Explanation: The explanation for this question will be added soon!
Correct answer: lodoethane, ethene, bromocthane- A. 2 - butanol
- B. 2 - methyl - 1 - butanol
- C. 2 - methyl - 2 - butanol
- D. 2,2 - dimethyl - 1 - butanol
Explanation: The reactivity of alcohols towards Lucas reagent (a mixture of concentrated HCl and ZnCl₂) depends on the stability of the carbocation…
Correct answer: 2 - methyl - 2 - butanol- A. 2 - methyl - 2 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 1 - pentanol
- B. 2 - methyl - 2 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 1 - pentanal
- C. 2 - methyl - 1 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 2 - pentanol
- D. 2 - methyl - 1 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 2 - pentanal
Explanation: Tertiary carbocation is more reactive than secondary carbocation while secondary carbocation is more reactive than primary
Correct answer: 2 - methyl - 1 - pentanol < 3 - methyl - 2 - pentanol < 2 - methyl - 2 - pentanol- A. Williamson synthesis
- B. Dehydration with H₂SO₄ at 140°C
- C. Oxidation with KMnO₄
- D. Reaction with NaOH
Explanation: Ethanol is dehydrated with conc. H₂SO₄ at 140°C to form diethyl ether via intermolecular dehydration.
Correct answer: Dehydration with H₂SO₄ at 140°C- A. 2, 4 - DNPH test
- B. Tollen's test
- C. Lucas test
- D. Fehling's solution test
Explanation: The "Lucas test" uses Lucas Reagent, which is a solution of Anhydrous zinc in concentrated H2SO4.
Correct answer: Lucas test- A. 2-propanol
- B. 1- propanol
- C. 2 - ethanol
- D. 2 - propane-1-ot
Explanation: Reason: Isopropyl alcohol is another name for 2-propanol.
Correct answer: 2-propanol- A. CH3CH2OH
- B. CH3COOCH3
- C. CH3COCH3
- D. CH3CHO
Explanation: A Grignard reagent reacts with compounds containing active H atom, such as water, ammonia, amines, alcohols, alkynes etc., to form a…
Correct answer: CH3CH2OH- A. H3PO4
- B. H3PO2
- C. HPO3
- D. H3PO3
Explanation: 3 moles of OH- react with one mole of Phosphorus to form one mole of P(OH)3 or H3PO3. 3C2H5OH+PBr3→3C2H5Br + H3PO3
Correct answer: H3PO3- A. CH3 CO2 H and NaOH
- B. C6H5OH and Na
- C. C6H5NH2 and HCl
- D. CH3CO2H and PCl5
- E. CH3COCH3 and LiAlH4
Explanation: Option E is correct because it leads to a reduction reaction of a ketone which forms a secondary alcohol which is a neutral substance.
Correct answer: CH3COCH3 and LiAlH4- A. Ketone
- B. Aldehyde
- C. Ester
- D. Amide
Explanation: Oxidation of primary alcohol leads to the formation of aldehyde.
Correct answer: Aldehyde- 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