Benzene and its Derivatives MCQ and Answers

Benzene and its Derivatives MCQ and Answers of Pharmaceutical Organic Chemistry 2 B.Pharm 2nd 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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1. The molecule must have ______ π electrons to be
aromatic compound

• 2n+2
• 4n+2
• 6n+2
• 8n+2

Ans: 4n+2

2. Cyclopentadienyl cation is

• Aromatic
• Not aromatic
• Contains Five π electrons
• Heterocycle

Ans: Aromatic

3. Electrophiles are

• Rich in electrons
• Neutral
• More affinity to nucleas
• Less affinity to nucleas

Ans: More affinity to nucleas

4. Catalyst used in Friedel-crafts alkylation is

• Ammonium chloride
• Aluminium chloride
• Calcium chloride
• Sodium chloride

Ans: Aluminium chloride

5. Kolbe reaction is a characteristic reaction for

• Carboxylic acids
• Amines
• Phenols
• Alcohols

Ans: Phenols

6. Reimer-Tiemann reaction is a characteristic reaction for

• Carboxylic acids
• Amines
• Phenols
• Alcohols

Ans: Phenols

7. Which of the following is a weakly activating group

• -F
• -Br
• -NH2
• -C2H5

Ans: -C2H5

8. In the mechanism of electrophilic aromatic substitution reaction, intermediate formed is

• Carbocation
• Carbanion
• Neutral
• Basic

Ans: Carbocation

9. In the mechanism of electrophilic aromatic substitution reaction

• Ist step is rate determining step
• IInd step is slow step
• IInd step is rate determining step
• Ist step is Fast step

Ans: 1st Step is the rate-determining step

10. Electron releasing group in an electrophilic aromatic substitution reaction

• Stabilizes Carbocation
• Destabilizes Carbocation
• Deactivates ring
• Do not have any effect

Ans: Stabilizes Carbocation

11. Chloro group is

• Electron withdrawing by resonance effect
• Electron withdrawing by inductive effect
• Electron withdrawing by both inductive and resonance effect
• Electron donating by both inductive and resonance effect

Ans: Electron withdrawing by inductive effect

12. Toluene undergoes electrophilic aromatic substitution reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Both para and ortho substituted product

13. Nitrobenzene undergoes an electrophilic aromatic substitution reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Meta substituted product

14. Chlorobenzene undergoes electrophilic aromatic substitution reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Both para and ortho substituted product

15. In the case of carbocation intermediate in electrophilic aromatic substitution of aniline, stable resonance structure has

• Pentet electrons
• hextet electrons
• heptet electrons
• octet electrons

Ans: octet electrons

16. Iodobenzene undergoes the electrophilic aromatic substitution reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Both para and ortho substituted product

17. Protonated dimethylaniline undergoes the electrophilic aromatic substitution reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Meta substituted product

18. Benzaldehyde undergoes nitration reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Meta substituted product

19. Acetanilide undergoes nitration reaction to give

• Only para substituted product
• Only ortho substituted product
• Both para and ortho substituted product
• Meta substituted product

Ans: Both para and ortho substituted product

20. 4- methyl acetanilide undergoes bromination gives chief product i.e.,

• 2-bromo-4- methyl acetanilide
• 3-bromo-4- methyl acetanilide
• 5-bromo-4- methyl acetanilide
• 2,3-dibromo-4- methyl acetanilide

Ans: 2-bromo-4- methyl acetanilide

21. 4-hydroxy toluene on nitration gives ____ as chief product

• 2-Nitro-4-hydroxy toluene
• 3-Nitro-4-hydroxy toluene
• 2,6-Dinitro-4-hydroxy toluene
• 3,5-Dinitro-4-hydroxy toluene

Ans: 3-Nitro-4-hydroxy toluene

22. What is the name of C6H5-CH2 group?

• aryl
• arenyl
• benzyl
• phenyl

Ans: benzyl

23. Which will not result in a reaction?

• C6H5OH + Br2
• C6H5OH + NaOH
• C6H5OH + Na2CO3
• C6H5OH + HNO3/H2SO4

Ans: C6H5OH + Na2CO3

24. Which of the following represents the best reagent(s) for the electrophilic nitration of benzene?

• NO2
• HNO2
• HNO3
• H2SO4, HNO3

Ans: H2SO4, HNO3

25. Predict the major product when nitrobenzene reacts with methyl chloride in the presence of aluminium chloride

• nitrobenzene
• o-nitrotoluene and p-nitrotoluene
• m-nitrotoluene
• chlorobenzene

Ans: m-nitrotoluene

26. Predict the major product when toluene reacts with methyl chloride in the presence of aluminium chloride

• o-chlorotoluene and p-chlorotoluene
• m-chlorotoluene
• o-dimethylbenzene and p-dimethylbenzene
• m-dimethylbenzene

Ans: o-dimethylbenzene and p-dimethylbenzene

27. Aldehyde group in benzaldehyde is

• ortho and para directing
• meta directing
• para directing
• ortho directing

Ans: meta directing

28. Bromine group in bromobenzene is

• ortho and para directing
• meta directing
• para directing
• ortho directing

Ans: ortho and para directing

29. Which of the following statements is incorrect for aromatic compounds

• Are planar
• Have 4n+2 π-electrons
• Have 4n π-electrons
• Are cyclic

Ans: Have 4n π-electrons

30. When considering electrophilic aromatic substitution reactions electron-donating
substituents (e.g. methoxy) are described as

• ortho/para directing and activating
• ortho/para directing and deactivating
• meta directing and activating
• meta directing and deactivating

Ans: ortho/para directing and activating

31. How many pairs of degenerate π molecular orbitals are found in benzene?

• 6
• 5
• 4
• 2

Ans: 2

32. Chemically DDT is

• dichlorodiphenyltrichloroethane
• dichloroethane
• trichloroethane
• dichloropropane
• trichlorobutane

Ans: dichlorodiphenyltrichloroethane

33. Saccharine is a derivative of

• benzothiazole
• benzotriazole
• benzimidazole
• benzoxazole

Ans: benzothiazole

34. Chloramine is used as

• preservative
• artificial sweetener
• disinfectant
• flavouring agent

Ans: disinfectant

35. Saccharine is used as

• preservative
• artificial sweetener
• flavouring agent
• colouring agent

Ans: artificial sweetener

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