Aniline MCQ

MCQs on Aniline Chemistry (25 Questions)

1. Which reagent is used to reduce nitrobenzene to aniline?

A. H₂/Pd

B. Sn/HCl

C. NaBH₄

D. LiAlH₄

Answer: B

2. What is the product of Hofmann degradation of an amide?

A. Nitro compound

B. Aniline

C. Primary amine

D. Amide

Answer: C

3. Hofmann degradation results in the loss of how many carbon atoms from the original amide?

A. 0

B. 1

C. 2

D. None

Answer: B

4. Which of the following is not involved in preparing aniline from nitrobenzene?

A. Sn

B. HCl

C. HNO₃

D. Heat

Answer: C

5. The reaction of CH₃CO-NH₂ with Br₂ and KOH gives:

A. Acetamide

B. Ethylamine

C. Methylamine

D. Acetic acid

Answer: C

6. Disproportionation of HNO₂ produces:

A. NO₂ and H₂O

B. HNO₃ and NO

C. NH₃ and NO

D. N₂O and H₂O

Answer: B

7. In identifying tertiary amines, which compound is not formed?

A. Alcohol

B. Bubbles of N₂

C. Yellow precipitate

D. Soluble salt

Answer: C

8. Which is a test used to differentiate primary, secondary, and tertiary amines?

A. Benedict’s Test

B. Tollen’s Test

C. HNO₂ reaction

D. Bromine water

Answer: C

9. Zwitter ions contain:

A. Only +ve charge

B. Only -ve charge

C. Both +ve and -ve charges

D. Neutral molecule

Answer: C

10. In the basicity of aniline derivatives, which factor increases basic strength?

A. Steric hindrance

B. Resonance

C. Electron-donating group

D. Electron-withdrawing group

Answer: C

11. Which amine cannot form hydrogen bonds with water easily?

A. 1° amine

B. 2° amine

C. 3° amine

D. All form equally

Answer: C

12. Which test gives a foul "dead fish" smell when reacting with 1° amine?

A. Diazotization

B. Carbylamine test

C. Lucas test

D. Bromine test

Answer: B

13. Azo compounds contain which bond?

A. C–C

B. N=N

C. N–H

D. C=N

Answer: B

14. The white precipitate formed by heating AgNO₃ with chloroform is due to:

A. AgBr

B. AgCl

C. Ag₂CO₃

D. AgNO₃

Answer: B

15. What is the product of diazotization of aniline?

A. Benzenediazonium chloride

B. Nitrobenzene

C. Phenol

D. Benzyl chloride

Answer: A

16. What is the product when benzenediazonium chloride reacts with phenol?

A. Azo dye

B. Nitrobenzene

C. Benzyl alcohol

D. Aniline

Answer: A

17. Which statement is true about chloroform under UV light with oxygen?

A. Stable compound

B. Converts to CO₂ and HCl

C. Ruins sample

D. Improves purity

Answer: C

18. Which intermediate is not seen in diazotization reaction?

A. Nitrosonium ion

B. NOCl

C. Nitrosoamine

D. Benzenediazonium ion

Answer: C

19. Which compound can be used to detect chloroform impurity?

A. KMnO₄

B. NaOH

C. AgNO₃

D. Na₂CO₃

Answer: C

20. What’s formed when 2° amine reacts with HNO₂?

A. Alcohol

B. Nitrosoamine

C. Yellow ppt

D. Amide

Answer: B

21. How many types of amines can be differentiated using the HNO₂ test?

A. 1

B. 2

C. 3

D. None

Answer: C

22. In a 3° amine + HNO₂ test, the product is:

A. Yellow ppt

B. Carbylamine

C. Soluble ammonium salt

D. Amide

Answer: C

23. Which amine is least basic due to resonance effects?

A. Aniline

B. Ethylamine

C. Dimethylamine

D. Methylamine

Answer: A

24. Which is used to prepare HNO₂ freshly in lab?

A. NaNO₂ + HCl

B. HNO₃ + Zn

C. NaNO₃ + H₂SO₄

D. NaCl + HNO₃

Answer: A

25. During diazotization, temperature should be kept around:

A. -10°C

B. 0–5°C

C. Room temp

D. 100°C

Answer: B