MCQ Diazonium Salts, Class 12 Chemistry

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. Benzene diazonium chloride when reacts with hypophosphorus acid produces

Benzene

Phenyl phosphate

Phenol

Phenyl isocyanide

Question 1 of 20

2. p-amino azo benzene is obtained by treating diazoniumchloride with:

Phenol

Aniline

Alcohol

Benzoic acid

Question 2 of 20

3. When hypophosphorous acid is treated with diazonium salts, it is reduced to:

Arenes

Methane

Ethyl alcohol

Amines

Question 3 of 20

4. Which of the following amine will form stable diazonium salt at 273-283 K ?

C₆H₅NH₂

C₆H₅N(CH₃)₂

C₂H₅NH₂

C₆H₅CH₂NH₂

Question 4 of 20

5. Replacement of diazo group by other groups is helpful in preparing those substituted aromatic compounds which cannot be prepared by:

Direct elimination

Addition reaction

Direct substitution

Replacement reaction

Question 5 of 20

6. ArN2+Cl^- ArX + N2 is called as:

Gattermanns reaction

Sandmeyers reaction

Dehydrogenation reaction

Esterification reaction

Question 6 of 20

7. Which of the following amine gives diazonium salt on reaction with HNO₂?

(CH₃)₂NH

CH₃NH₂

C₆H₅NH₂

(CH₃)₃N

Question 7 of 20

8. An azo compound is formed when benzene diazonium chloride reacts with:

2,4,6-Trimethylphenol

Both (A) and (B)

Phenol

Aniline

Question 8 of 20

9. What happens when benzene diazonium chloride is treated with potassium cyanide in presence of Cu powder?

Benzophenone

Methyl isocyanide

Acetonitrile

Benzonitrile

Question 9 of 20

10. When ethanol is treated with benzene diazoniumchloride it forms:

Arenes

Ethyl alcohol

Amines

Methane

Question 10 of 20

11. The conversion of primary aromatic amines into diazonium salts is known as:

Diazotisation

Alkylation

Acylation

Displacement

Question 11 of 20

12. By treating diazonium salts with cuprous cyanide or KCN and copper powder it forms:

Citric acid

Benzoic acid

Aryl nitrile

Oxalic acid

Question 12 of 20

13. Benzene diazonium chloride forms orange red dye with:

Nitrophenol

Benzophenol

Resorcinol

Methanol

Question 13 of 20

14. The stability of benzene diazonium salts is because of

Inductive effect

Mesomeric effect

Hyperconjugation

Resonance

Question 14 of 20

15. Azo-dye test is given by:

All amines

Only primary amines

Only primary aliphatic amines

Only primary aromatic amines

Question 15 of 20

16. The general formula of Diazonium salt is:

RN₂⁺X^-

RN⁺

RXI

RN₂⁺HSO^-₄

Question 16 of 20

17. When diazonium salt solution is treated with KI, it forms:

Bromobenzene

Iodobenzene

Phenol

Acid

Question 17 of 20

18. Diazo coupling is useful to prepare:

Pesticides

Vitamins

Dyes

Proteins

Question 18 of 20

19. Benzene diazonium chloride on reaction with phenol in weakly basic medium gives:

p-Hydroxyazobenzene

Benzene

Diphenyl ether

Chlorobenzene

Question 19 of 20

20. When diazonium salt solution is treated with water at a temperature of 283 K it forms?

Ester

Phenol

Amines

Alcohol

Question 20 of 20

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