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 8 of 27
- A. Aldehyde formed may be oxidized further to carboxylic acid concerned
- B. Aldehyde formed is unstable and decompose back to original precursor i.e. primary alcohol
- C. Aldehyde may be oxidised further to a ketone
- D. Aldehyde formed may react with primary alcohol, the original reactant.
Explanation: Aldehyde formed may be oxidized further to carboxylic acid Primary alcohols oxidized with acidified K2 Cr2O7/Na2Cr2O7 can form aldehydes.
Correct answer: Aldehyde formed may be oxidized further to carboxylic acid concerned- A. 1 - Propanol
- B. 2- methyl - 2- propanol
- C. 2- methyl - 1- propanol
- D. 2 - propanol
Explanation: 2-methyl-2-propanol / tert-Butyl alcohol, also called tert-butanol or t-butanol, is the simplest tertiary alcohol, with a formula of…
Correct answer: 2- methyl - 2- propanol- A. 1 - butanol
- B. 1, 2, 3 - propanetriol
- C. 2 - methyl - propanol
- D. Isobutyl alcohol
Explanation: Glycerol contains three carbons, giving it the "propane" part to its name.
Correct answer: 1, 2, 3 - propanetriol- A. Ethyl Acetate
- B. Octyl Acetate
- C. Amyl Butyrate
- D. Benzyl Acetate
Explanation: Benzyl Acetate has a pleasant sweet aroma reminiscent of jasmine, and is used as a flavoring agent in jasmine or apple flavors to various…
Correct answer: Benzyl Acetate- A. Picric acid
- B. Nitrophenol
- C. TNT
- D. Benzophenone
Explanation: Correct option is A. The other name of 2,4,6-trinitrophenol is picric acid. It is a yellow, crystalline solid that is highly explosive.
Correct answer: Picric acid- A. Alkene
- B. Ether
- C. Carboxylic acid
- D. Aldehydes
Explanation: Correct option is B.Alcohols on dehydration can produce ethers as well as alkene under different conditions but mainly ether.Alcohol can…
Correct answer: Ether- A. Alcohols
- B. Alkenes
- C. Phenols
- D. Alkanes
Explanation: Correct option is A. Aldehyde and ketones are reduced by sodium borohydride and lithium aluminum hydride.
Correct answer: Alcohols- A. O - H bond formed.
- B. O - H bond breaks.
- C. C - O bond breaks.
- D. Rise in boiling point.
Explanation: Correct option is B. Alcohols react both as nucleophiles and electrophiles.
Correct answer: O - H bond breaks.- A. Formation of carboxylate salt
- B. Brick red precipitate formation
- C. Yellow crystals
- D. Formation of water
Explanation: The positive result of the iodoform test is indicated by the formation of yellow crystals.
Correct answer: Yellow crystals- A. Acetone
- B. Hydroxyl amine
- C. Methyl cyanide
- D. Ethyl acetate
Explanation: Ethyl acetate, upon hydrolysis by mineral acid, gives ethanol and acetic acid. Ethanol is a primary alcohol.
Correct answer: Ethyl acetate- A. DDT
- B. Teflon
- C. Iodoform
- D. Dynamite
Explanation: DDT or dichlorodiphenyltrichloroethane is a colorless crystalline compound commonly used as an insecticide in the agriculture sector.
Correct answer: DDT- A. Sucrose
- B. Glucose
- C. Galactose
- D. Mannose
Explanation: Sucrose or cane sugar is widely distributed among higher plants. Its commercial source is solely sugarcane and beet.
Correct answer: Sucrose- A. None of these
- B. On heating
- C. Immediately
- D. After 5-10 minutes
Explanation: This is the reaction indicating Lucas Test which uses Lucas Reagent(ZnCl2+conc.HCl).Since 1-Propanol is a primary alcohol, it reacts with…
Correct answer: On heating- A. H2SO4/H2O
- B. NaOH
- C. PCl3
- D. All of these options are correct
Explanation: Ethanol can react with PCl3 (phosphorus trichloride) to form ethyl chloride (ethyl alcohol).
Correct answer: PCl3- A. Ease of removal of proton
- B. Stability of the anion formed
- C. Stability of the cation formed
- D. Depends on both ease of removal of proton and stability of the anion formed
Explanation: The correct option is: Depends on both ease of removal of a proton and stability of the anion formed.Explanation:The strength of an acid…
Correct answer: Depends on both ease of removal of proton and stability of the anion formed- A. CH3OH
- B. CH3CH2OH
- C. C6H5OH
- D. C6H11OH
Explanation: Option A is correct as hydrogen bonding is prominent In lower alcohols such as methanol
Correct answer: CH3OH- A. CH3C(CH3)2OH
- B. CH3CH(CH3)OH
- C. Both A and B
- D. C2H5OH
Explanation: Tertiary alcohols do not undergo oxidation to produce carboxylic acids.
Correct answer: CH3C(CH3)2OH- A. liquor
- B. grain alcohol
- C. wood spirit
- D. fuel
Explanation: Methanol has the formula CH2OH. It is known as wood alcohol because it was once produced by the destructive distillation ( decomposition…
Correct answer: wood spirit- A. a colourful crystalline solid
- B. more reactive to nucleophillic attack
- C. form link solution at room temperature
- D. dissolves readily in alkalines
Explanation: The OH group of phenol determines its properties. The OH group makes the phenol acidic and hence the acidic property allows it to dissolve…
Correct answer: dissolves readily in alkalines- A. Pyridine
- B. Methanol
- C. Acetone
- D. All of these options are correct
Explanation: Although Pyridine is used in some medicines and flavorings as a solvent, it is also a main constituent for toxic substances like dyes…
Correct answer: All of these options are correct