Phenols MCQ with Answers

Phenols MCQ with Answers of Pharmaceutical Organic Chemistry 2 B.Pharm 3rd Semester. All the Multiple Choice Questions and Answers share in this post are extremely helpful from an exam perspective so read and learn them all.

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Phenols MCQ with Answers | Pharmaceutical Organic Chemistry 2 | B.Pharm 3rd Semester

1. Phenol can be converted to p- & o Hydroxyphenyl ethyl ketone by

• Riemen-Tiemann reaction
• Fries rearrangement
• Claisens rearrangement
• Kolbe reaction

Ans: Fries rearrangement

2. Phenol can be converted into salicylaldehyde by

• Riemen-Tiemann reaction
• Fries rearrangement
• Claisens rearrangement
• Kolbe reaction

Ans: Riemen-Tiemann reaction

3. Benzyl Phenyl ether is obtained from benzyl bromide and phenol in the presence of a catalyst

• Con HCl
• Con H2SO4
• Aq HNO3
• aq. NaOH

Ans: aq. NaOH

4. Which of the following is O-hydroxy phenol

• Catechol
• Resorcinol
• Hydroquinone
• Cresol

Ans: Catechol

5. Which of the following is p-hydroxy phenol

• Catechol
• Resorcinol
• Hydroquinone
• Cresol

Ans: Hydroquinone

6. Which of the following is m-hydroxy phenol

• Catechol
• Resorcinol
• Hydroquinone
• Cresol

Ans: Resorcinol

7. Which of the following is 3-methyl phenol

• Catechol
• Resorcinol
• Hydroquinone
• Cresol

Ans: Cresol

8. Phenol is soluble in

• Aq NaOH
• Aq NaHCO3
• Aq HCl
• None

Ans: Aq NaOH

9. Anisole can be synthesised from phenol using

• Methyl sulfate and NaOH
• Methyl sulfate and HCl
• Methyl acetate and NaOH
• Methyl acetate and HCl

Ans: Methyl sulfate and NaOH

10. Phenol on distillation with Zinc dust gives

• Phenylzinc
• Benzene
• Cyclohexanone
• Benzoic acid

Ans: Benzene

11. Phenol is an ortho-para director because the hydroxyl group :

• donates electrons that increase electron density at ortho and para positions favouring nucleophilic attack
• donates electrons that increase electron density at ortho and para positions favoring electrophilic attack.
• donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring nucleophilic attack of the ring.
• donates electrons to the ortho and para positions and attracts electrons away from meta positions favoring electrophilic attack on the ring.

Ans: donates electrons that increase electron density at ortho and para positions favoring electrophilic attack.

12. Hydrolysis of benzal chloride gives

• Phenol
• Benzaldehyde
• Benzyl alcohol
• Benzoyl chloride

Ans: Benzaldehyde

13. Benzenediazonium chloride reacts with warm water to give

• Aniline
• Phenol
• Benzene
• Chlorobenzene

Ans: Phenol

14. Benzenediazonium chloride reacts with phenol to form :

• p-chlorophenol
• Chlorobenzene
• p-Hydroxyazobenzene
• DDT

Ans: p-Hydroxyazobenzene

15. Phenol is used

• in alcoholic beverages
• as anesthetic
• in antiseptics
• as moth repellant

Ans: in antiseptics

16. When phenol is treated with neutral FeCl3 solution, it develops

• Violet color
• Yellow color
• Green color
• None of the above

Ans: Violet color

17. Which of the following compounds will react with PCl5 least vigorously?

• Ethanol
• Acetic acid
• Phenol
• Benzoic acid

Ans: Phenol

18. Phenol reacts with excess bromine water to give

• o- plus p-Bromophenol
• Bromobenzene
• 2,4,6-Tribromophenol
• m-Bromophenol

Ans: 2,4,6-Tribromophenol

19. Anisole is formed when phenol is treated with

• CH3I/NaOH
• CH3CH2I/NaOH
• CHCl3/NaOH
• Acetic anhydride

Ans: CH3I/NaOH

20. Anisole on heating with concentrated HI gives

• Iodobenzene
• Phenol + CH3I
• Iodobenzene + CH3OH
• Phenol + CH3OH

Ans: Phenol + CH3I

21. Which group forms the strongest H-bonds to water molecules?

• Alcohols
• Ethers
• Phenols
• All of the above

Ans: Phenols

22. Which of the following compounds will react with PCl5 least vigorously?

• Ethanol
• Acetic acid
• Phenol
• Benzoic acid

Ans: Phenol

23. When phenol is treated with neutral FeCl3 solution, it develops

• Violet color
• Yellow color
• Green color
• None of the above

Ans: Violet Colour

24. Phenol is acidic because of

• Resonance
• Electromeric effect
• Inductive effect
• Peroxide effect

Ans: Resonance

25. Which of the following has the most acidic proton?

• Thiol
• Alcohol
• Phenol
• Ether

Ans: Phenol

26. Phenol is

• stronger acid than acetic acid
• weaker acid than acetic acid
• stronger base than methylamine
• weaker base than methylamine

Ans: weaker acid than acetic acid

27. Which of the following compounds is most acidic?

• o-Cresol
• p-Nitrophenol
• p-Cresol
• p-Chlorophenol

Ans: p-Nitrophenol

28. Which of the following compounds is most acidic?

• Phenol
• m-Nitrophenol
• m-Cresol
• m-Bromophenol

Ans: m-Nitrophenol

29. Phenols can be easily distinguished from alcohols because

• phenols are soluble in NaOH, but alcohols are not
• alcohols are soluble in NaOH, but phenols are not
• phenols are soluble in NaHCO3, but alcohols are not
• alcohols are soluble in NaHCO3, but phenols are not

Ans: phenols are soluble in NaOH, but alcohols are not

30. Which of the following statements is true :

• o-Nitrobenzoic acid is more acidic than p-nitrophenol
• o-Nitrobenzoic acid is less acidic than p-nitrophenol
• o-Nitrobenzoic acid and p-nitrobenzoic acid have the same acid strength
• None of these

Ans: o-Nitrobenzoic acid is more acidic than p-nitrophenol

31. Bakelite is obtained from :

• Phenol and formaldehyde
• Adipic acid and hexamethylene diamine
• Dimethyl terephthalate and ethylene glycol
• Neoprene

Ans: Phenol and formaldehyde

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