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 16 of 27
- A. increase acidic character of C2H5OH
- B. increase basic character of C2H5OH
- C. Make Cl a good nucleophile
- D. Make - OH a better leaving group
Explanation: The role of ZnCl2 in the reaction is to make the -OH group a better leaving group.Zinc chloride is a Lewis acid, which means that it can…
Correct answer: Make - OH a better leaving group- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The statement that R = H is more acidic than phenol is not true.Phenol is more acidic than a hydrogen atom bonded to an alkyl group…
Correct answer: Option D- A. -OH
- B. -NO2
- C. -COOH
- D. -SO3H
Explanation: Phosphorus trihalides or phosphorus pentahalides react with alcohols to replace the hydroxyl group (-OH) by a halo group.The reaction is…
Correct answer: -OH- A. primary alcohol
- B. Tertiary alcohol
- C. Secondary alcohol
- D. None of them
Explanation: A secondary alcohol is an organic compound that has a hydroxyl group (-OH) bonded to a carbon atom that is bonded to two other carbon…
Correct answer: Secondary alcohol- A. C6H5OH
- B. C6H5CH2 OH
- C. C6H5C2H4 OH
- D. C6H5 COOH
Explanation: The formula of benzyl alcohol is C7H8O. It is a secondary alcohol, which means that the hydroxyl group (-OH) is bonded to a carbon atom…
Correct answer: C6H5CH2 OH306. in IUPAC system:
- A. 1,2 - Ethanol
- B. 1,2 -Ethanediol
- C. Ethanediol
- D. Diethanol
Explanation: 1,2-ethanediol is an organic compound with the formula HOCH2CH2OH. It is also known as ethylene glycol or 1,2-dihydroxyethane.
Correct answer: 1,2 -Ethanediol- A. Primary
- B. Tertiary
- C. Secondary
- D. Long chain
Explanation: Tertiary alcohols are resistant to oxidation because they do not have a hydrogen atom attached to the carbon atom that is bonded to the…
Correct answer: Tertiary- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option C- A. 2, 4, 6-Trinitrophenol
- B. o-Nitrophenol
- C. p-Nitrophenol
- D. Nitrobenzene
Explanation: Phenol on treatment with conc HNO3 gives 2,4,6-Trinitrophenol also called picric acid.
Correct answer: 2, 4, 6-Trinitrophenol- A. HCHO
- B. HCOOH
- C. CH3OH
- D. CH2OHCH2OH
Explanation: Alcohol will be the product if hydrolysis is done in the absence of zinc dust.
Correct answer: CH3OH- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option D- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: This is the reduction reaction of ketone with sodium borohydride, in which 2° ketone is reduced to 2° alcohol.
Correct answer: Option A- A. HCl > HBr > HI
- B. HI > HCl > HBr
- C. HI > HBr > HCl
- D. HBr > HCl > HI
Explanation: R - OH → R-X + H2ONucleophilicity: I > Br > Cl > F This depends upon bond length.
Correct answer: HI > HBr > HCl- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The stability of a geminal diol depends on the electron-withdrawing strength of EWG(electron withdrawing group) attached to the Carbon…
Correct answer: Option C- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The following is the solution:Dimension of E0=(M−1L−3T4A2) Dimension of E(Electric field)=(MLT−1A−1)
Correct answer: Option A- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Cumene reacted with O2 gives phenol and propanone using catalyst H2SO4 at 60-80˚C.Following is the solution to this question:
Correct answer: Option B- A. Lucas reagent
- B. Victor-Meyer test
- C. I2/NaOH
- D. All of these
Explanation: 1˚and 2˚ Alcohols can be distinguished by the Lucas reagent and Victor-Meyer test.
Correct answer: All of these- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option A- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option B is a tertiary alcohol and hence undergoes dehydration at the fastest rate.
Correct answer: Option B- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option A