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 7 of 8
- A. Methanol
- B. Lactic acid
- C. Pyridine
- D. Acetone
Explanation: Methanol, pyridine and acetone are able to denature ethanol.Denaturation refers to the process of rendering alcohol undrinkable or…
Correct answer: Lactic acid- A. By Lucas test
- B. By silver mirror test
- C. By oxidation
- D. By Iodoform test
Explanation: The solution in the ethanol test tube should go cloudy and then a yellow precipitate of tri-iodomethane (iodoform) should be seen.
Correct answer: By Iodoform test- A. Calcium oxide
- B. Calcium chloride
- C. Calcium carbonate
- D. Carbon monoxide
Explanation: if we add lime (CaO) to the rectified spirit then the water of the mixture can be absorbed by the lime.
Correct answer: Calcium oxide- A. Primary
- B. Secondary
- C. Tertiary
- D. Polyhydride
Explanation: It is a tertiary alcohol. We can recognize the tertiary alcohol by seeing whether the C atom attached to the OH group (also known as alpha…
Correct answer: Tertiary- A. Less acidic than water
- B. Less basic than phenol
- C. More acidic than phenol
- D. More acidic than water
Explanation: The concentration of H+ ions determines the acidity. More H+ ions means the solution is more acidic as in the case of water while alcohol…
Correct answer: Less acidic than water- A. Propane and methyl Grignard
- B. Methyl ethyl ketone and methyl
- C. Propanaldehyde and ethyl Grignard
- D. None of these
Explanation: The addition of Grignard reagent to aldehydes leads to the production of secondary alcohol, and the addition of ketone leads to the…
Correct answer: Propanaldehyde and ethyl Grignard- A. Cu
- B. CuO
- C. Cu2O
- D. Cu2O + Cu2O3
Explanation: Fehling solution is reduced by aldehydes and a red precipitate of Cu2O is obtained.
Correct answer: Cu2O- A. Diethyl ether
- B. Ethane
- C. Ethanal
- D. Ethanol
Explanation: When CH3CH2l reacts with dry Ag2O, the correct product formed is ethanol.
Correct answer: Ethanol- A. C2H6
- B. C2H2Cl
- C. CH3OCH3
- D. C2H5OH
Explanation: Among the given compounds, C2H5OH (ethanol) has the highest boiling point.
Correct answer: C2H5OH- A. Alkoxides
- B. Ethane
- C. Alkane
- D. Alloyed
Explanation: Alcohols react with sodium to form a salt (sodium alkoxide) and bubbles of hydrogen gas will be seen.
Correct answer: Alkoxides- A. Carbonal
- B. Methanol
- C. Ethanol
- D. Glycol
Explanation: (D) is correct because the product of this reaction is ethylene glycol, which is a colorless, odorless, and slightly viscous liquid.
Correct answer: Glycol- A. Witting reaction
- B. Tollen test
- C. Lucas test
- D. Ninhydrin test
Explanation: The Lucas test is commonly used to differentiate between primary, secondary, and tertiary alcohols.
Correct answer: Lucas test133. Rectified spirit is:
- A. 100% ethanol
- B. 95% ethanol
- C. 90% ethanol
- D. 35% ethanol
Explanation: Rectified spirit, also known as neutral spirits, is a high-purity ethanol solution that has undergone multiple distillation processes…
Correct answer: 95% ethanol- A. Alcohols
- B. Phenols
- C. Amino acids
- D. Carboxylic acids
Explanation: The Lucas test is a chemical test used to differentiate between primary, secondary, and tertiary alcohols.
Correct answer: Alcohols- A. Methanol
- B. Formaldehyde
- C. Formic acid
- D. Carbon dioxide gas
Explanation: The complete oxidation of methane in the presence of a copper catalyst at high pressure (200 atm) leads to the formation of methanol.
Correct answer: Methanol- A. CH3CH2OH + PCl5 →
- B. CH3CH2OH + Na →
- C. CH3CH2OH + PCl3 →
- D. CH3CH2OH + 5OCl →
Explanation: The correct answer is Option B: CH3CH2OH + Na →. In this reaction, sodium (Na), a metal, reacts with ethanol (CH3CH2OH) to form sodium…
Correct answer: CH3CH2OH + Na →- A. Primary alcohol
- B. Secondary alcohol
- C. Tertiary alcohol
- D. All of the above
Explanation: Ketones are prepared by the oxidation of secondary alcohols. When a secondary alcohol is oxidized, it loses hydrogen atoms and forms a…
Correct answer: Secondary alcohol- A. COCH3
- B. (CH 3)2 CHOH
- C. (CH3)3COH
- D. CH3CH2OH
Explanation: To undergo dehydrogenation, the compound must have OH group. Only compound in option A is not an alcohol thus, it is the correct answer.
Correct answer: COCH3139. To distinguish among primary, secondary and tertiary alcohols which of the following tests is used?
- A. Benedicts reagent
- B. Tollen's reagent
- C. Lucas test
- D. None of the above
Explanation: The lucas test is used to differentiate between primary, secondary and tertiary alcohols,an oily layer of alkyl halides separates out in…
Correct answer: Lucas test- A. Alkene
- B. Sodum alkoxide
- C. Alkane
- D. Ether
Explanation: When alcohols react with metals a salt is formed,the reaction when a monohydric alcohol reacts with sodium metal results in the production…
Correct answer: Sodum alkoxide