Diazonium salts - preparation, reactions and synthetic importance — NEET & JEE Questions

Question 1 · difficulty L1 · recall

Benzenediazonium chloride is commonly prepared from aniline using nitrous acid generated in situ at

• A. low temperature, about 0–5°C
• B. about 100°C
• C. red heat
• D. any temperature with no effect

Question 2 · difficulty L2 · understanding

Given below are two statements I and II. Statement I : Dumas method is used for estimation of "Nitrogen" in an organic compound. Statement II : Dumas method involves the formation of ammonium sulphate by heating the organic compound with conc $\mathrm{H}_2 \mathrm{SO}_4$. In the light of the above statements, choose the correct answer from the options given below

• A. Statement I is true but Statement II is false
• B. Statement I is false but Statement II is true
• C. Both Statement I and Statement II are true
• D. Both Statement I and Statement II are false

Question 3 · difficulty L2 · understanding

Given below are two statements : Statement I : Piciric acid is 2,4,6 - trinitrotoluene. Statement II : Phenol - 2,4 - disulphonic acid is treated with Conc. $$\mathrm{HNO}_3$$ to get picric acid. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Statement I is incorrect but Statement II is correct
• B. Both Statement I and Statement II are incorrect
• C. Both Statement I and Statement II are correct
• D. Statement I is correct but Statement II is incorrect

Question 4 · difficulty L2 · understanding

Which of the following nitrogen containing compound does not give Lassaigne's test ?

• A. Glycene
• B. Phenyl hydrazine
• C. Urea
• D. Hydrazine

Question 5 · difficulty L2 · understanding

A primary aliphatic amine on reaction with nitrous acid in cold (273 K) and there after raising temperature of reaction mixture to room temperature (298 K), gives a/an

• A. nitrile
• B. alcohol
• C. diazonium salt
• D. secondary amine

Question 6 · difficulty L2 · understanding

In the chemical reactions given above A and B respectively are :

• A. H 3 PO 2 and CH 3 CH 2 Cl
• B. CH 3 CH 2 OH and H 3 PO 2
• C. H 3 PO 2 and CH 3 CH 2 OH
• D. CH 3 CH 2 Cl and H 3 PO 2

Question 7 · difficulty L2 · understanding

Number of amine compounds from the following giving solids which are soluble in $$\mathrm{NaOH}$$ upon reaction with Hinsberg's reagent is _________.

Question 8 · difficulty L2 · understanding

$$9.3 \mathrm{~g}$$ of pure aniline upon diazotisation followed by coupling with phenol gives an orange dye. The mass of orange dye produced (assume 100% yield/conversion) is ________ g. (nearest integer)

Question 9 · difficulty L2 · understanding

The compound formed by the reaction of ethanal with semicarbazide contains _________ number of nitrogen atoms.

Question 10 · difficulty L3 · understanding

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?

• A. Threonine
• B. Serine
• C. Tyrosine
• D. Cysteine